mirror of
https://github.com/cc65/cc65.git
synced 2025-04-08 19:38:55 +00:00
Some cleanup in the code generator. Added a g_drop function. g_drop and
g_space can now handle sizes > 255 bytes. git-svn-id: svn://svn.cc65.org/cc65/trunk@4370 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz
parent
1f92d6bfa2
commit
0ce362a69b
@ -405,28 +405,6 @@ void g_importmainargs (void)
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/*****************************************************************************/
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/* Load functions for various registers */
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/*****************************************************************************/
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static void ldxconst (unsigned val)
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/* Load x with a constant */
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{
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AddCodeLine ("ldx #$%02X", val & 0xFF);
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}
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static void ldyconst (unsigned val)
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/* Load y with a constant */
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{
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AddCodeLine ("ldy #$%02X", val & 0xFF);
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}
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/*****************************************************************************/
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/* Function entry and exit */
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/*****************************************************************************/
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@ -459,39 +437,30 @@ void g_leave (void)
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/* Function epilogue */
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{
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/* How many bytes of locals do we have to drop? */
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unsigned k = (unsigned) -StackPtr;
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unsigned ToDrop = (unsigned) -StackPtr;
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/* If we didn't have a variable argument list, don't call leave */
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if (funcargs >= 0) {
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/* Drop stackframe if needed. We can only drop 255 bytes at a time. */
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k += funcargs;
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while (k > 0) {
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unsigned ToDrop = (k > 255)? 255 : k;
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if (ToDrop <= 8) {
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AddCodeLine ("jsr incsp%d", k);
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} else {
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ldyconst (ToDrop);
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AddCodeLine ("jsr addysp");
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}
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k -= ToDrop;
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/* Drop stackframe if needed */
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g_drop (ToDrop + funcargs);
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} else if (StackPtr != 0) {
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/* We've a stack frame to drop */
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if (ToDrop > 255) {
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g_drop (ToDrop); /* Inlines the code */
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AddCodeLine ("jsr leave");
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} else {
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AddCodeLine ("ldy #$%02X", ToDrop);
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AddCodeLine ("jsr leavey");
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}
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} else {
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if (k == 0) {
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/* Nothing to drop */
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AddCodeLine ("jsr leave");
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} else {
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/* We've a stack frame to drop */
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while (k > 255) {
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AddCodeLine ("ldy #$FF");
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AddCodeLine ("jsr addysp");
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k -= 255;
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}
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ldyconst (k);
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AddCodeLine ("jsr leavey");
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}
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/* Nothing to drop */
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AddCodeLine ("jsr leave");
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}
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/* Add the final rts */
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@ -563,8 +532,8 @@ void g_save_regvars (int RegOffs, unsigned Bytes)
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/* More than two bytes - loop */
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unsigned Label = GetLocalLabel ();
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g_space (Bytes);
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ldyconst (Bytes - 1);
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ldxconst (Bytes);
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AddCodeLine ("ldy #$%02X", (unsigned char) (Bytes - 1));
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AddCodeLine ("ldx #$%02X", (unsigned char) Bytes);
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g_defcodelabel (Label);
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AddCodeLine ("lda regbank%+d,x", RegOffs-1);
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AddCodeLine ("sta (sp),y");
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@ -590,13 +559,13 @@ void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
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/* Don't loop for up to two bytes */
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if (Bytes == 1) {
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ldyconst (StackOffs);
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AddCodeLine ("ldy #$%02X", StackOffs);
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AddCodeLine ("lda (sp),y");
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AddCodeLine ("sta regbank%+d", RegOffs);
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} else if (Bytes == 2) {
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ldyconst (StackOffs);
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AddCodeLine ("ldy #$%02X", StackOffs);
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AddCodeLine ("lda (sp),y");
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AddCodeLine ("sta regbank%+d", RegOffs);
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AddCodeLine ("iny");
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@ -605,7 +574,7 @@ void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
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} else if (Bytes == 3 && IS_Get (&CodeSizeFactor) >= 133) {
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ldyconst (StackOffs);
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AddCodeLine ("ldy #$%02X", StackOffs);
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AddCodeLine ("lda (sp),y");
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AddCodeLine ("sta regbank%+d", RegOffs);
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AddCodeLine ("iny");
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@ -622,7 +591,7 @@ void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
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* code that uses just one index register.
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*/
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unsigned Label = GetLocalLabel ();
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ldyconst (StackOffs);
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AddCodeLine ("ldy #$%02X", StackOffs);
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g_defcodelabel (Label);
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AddCodeLine ("lda (sp),y");
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AddCodeLine ("sta regbank%+d,y", RegOffs - StackOffs);
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@ -637,8 +606,8 @@ void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
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*/
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unsigned Label = GetLocalLabel ();
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AddCodeLine ("stx tmp1");
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ldyconst (StackOffs + Bytes - 1);
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ldxconst (Bytes - 1);
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AddCodeLine ("ldy #$%02X", (unsigned char) (StackOffs + Bytes - 1));
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AddCodeLine ("ldx #$%02X", (unsigned char) (Bytes - 1));
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g_defcodelabel (Label);
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AddCodeLine ("lda (sp),y");
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AddCodeLine ("sta regbank%+d,x", RegOffs);
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@ -757,7 +726,7 @@ void g_getstatic (unsigned flags, unsigned long label, long offs)
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if ((flags & CF_FORCECHAR) || (flags & CF_TEST)) {
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AddCodeLine ("lda %s", lbuf); /* load A from the label */
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} else {
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ldxconst (0);
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AddCodeLine ("ldx #$00");
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AddCodeLine ("lda %s", lbuf); /* load A from the label */
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if (!(flags & CF_UNSIGNED)) {
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/* Must sign extend */
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@ -811,10 +780,10 @@ void g_getlocal (unsigned Flags, int Offs)
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case CF_CHAR:
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CheckLocalOffs (Offs);
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if ((Flags & CF_FORCECHAR) || (Flags & CF_TEST)) {
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ldyconst (Offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("lda (sp),y");
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} else {
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ldyconst (Offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("ldx #$00");
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AddCodeLine ("lda (sp),y");
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if ((Flags & CF_UNSIGNED) == 0) {
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@ -875,31 +844,30 @@ void g_getind (unsigned Flags, unsigned Offs)
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case CF_CHAR:
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/* Character sized */
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AddCodeLine ("ldy #$%02X", Offs);
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if (Flags & CF_UNSIGNED) {
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ldyconst (Offs);
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AddCodeLine ("jsr ldauidx");
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} else {
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ldyconst (Offs);
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AddCodeLine ("jsr ldaidx");
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}
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break;
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case CF_INT:
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if (Flags & CF_TEST) {
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ldyconst (Offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("sta ptr1");
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AddCodeLine ("stx ptr1+1");
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AddCodeLine ("lda (ptr1),y");
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AddCodeLine ("iny");
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AddCodeLine ("ora (ptr1),y");
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} else {
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ldyconst (Offs+1);
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AddCodeLine ("ldy #$%02X", Offs+1);
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AddCodeLine ("jsr ldaxidx");
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}
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break;
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case CF_LONG:
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ldyconst (Offs+3);
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AddCodeLine ("ldy #$%02X", Offs+3);
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AddCodeLine ("jsr ldeaxidx");
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if (Flags & CF_TEST) {
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g_test (Flags);
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@ -996,7 +964,7 @@ void g_leavariadic (int Offs)
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CheckLocalOffs (ArgSizeOffs);
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/* Get the size of all parameters. */
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ldyconst (ArgSizeOffs);
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AddCodeLine ("ldy #$%02X", ArgSizeOffs);
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AddCodeLine ("lda (sp),y");
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/* Add the value of the stackpointer */
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@ -1075,13 +1043,13 @@ void g_putlocal (unsigned Flags, int Offs, long Val)
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if (Flags & CF_CONST) {
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AddCodeLine ("lda #$%02X", (unsigned char) Val);
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}
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ldyconst (Offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("sta (sp),y");
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break;
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case CF_INT:
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if (Flags & CF_CONST) {
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ldyconst (Offs+1);
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AddCodeLine ("ldy #$%02X", Offs+1);
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AddCodeLine ("lda #$%02X", (unsigned char) (Val >> 8));
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AddCodeLine ("sta (sp),y");
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if ((Flags & CF_NOKEEP) == 0) {
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@ -1098,11 +1066,10 @@ void g_putlocal (unsigned Flags, int Offs, long Val)
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}
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AddCodeLine ("sta (sp),y");
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} else {
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AddCodeLine ("ldy #$%02X", Offs);
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if ((Flags & CF_NOKEEP) == 0 || IS_Get (&CodeSizeFactor) < 160) {
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ldyconst (Offs);
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AddCodeLine ("jsr staxysp");
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} else {
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ldyconst (Offs);
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AddCodeLine ("sta (sp),y");
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AddCodeLine ("iny");
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AddCodeLine ("txa");
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@ -1115,7 +1082,7 @@ void g_putlocal (unsigned Flags, int Offs, long Val)
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if (Flags & CF_CONST) {
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g_getimmed (Flags, Val, 0);
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}
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ldyconst (Offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("jsr steaxysp");
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break;
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@ -1171,20 +1138,18 @@ void g_putind (unsigned Flags, unsigned Offs)
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}
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/* Check the size and determine operation */
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AddCodeLine ("ldy #$%02X", Offs);
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switch (Flags & CF_TYPE) {
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case CF_CHAR:
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ldyconst (Offs);
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AddCodeLine ("jsr staspidx");
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break;
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case CF_INT:
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ldyconst (Offs);
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AddCodeLine ("jsr staxspidx");
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break;
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case CF_LONG:
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ldyconst (Offs);
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AddCodeLine ("jsr steaxspidx");
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break;
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@ -1761,19 +1726,19 @@ void g_addeqstatic (unsigned flags, unsigned long label, long offs,
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void g_addeqlocal (unsigned flags, int offs, unsigned long val)
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void g_addeqlocal (unsigned flags, int Offs, unsigned long val)
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/* Emit += for a local variable */
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{
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/* Calculate the true offset, check it, load it into Y */
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offs -= StackPtr;
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CheckLocalOffs (offs);
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Offs -= StackPtr;
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CheckLocalOffs (Offs);
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/* Check the size and determine operation */
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switch (flags & CF_TYPE) {
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case CF_CHAR:
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if (flags & CF_FORCECHAR) {
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ldyconst (offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("ldx #$00");
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if (flags & CF_CONST) {
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AddCodeLine ("clc");
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@ -1796,7 +1761,7 @@ void g_addeqlocal (unsigned flags, int offs, unsigned long val)
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/* FALLTHROUGH */
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case CF_INT:
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ldyconst (offs);
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AddCodeLine ("ldy #$%02X", Offs);
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if (flags & CF_CONST) {
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if (IS_Get (&CodeSizeFactor) >= 400) {
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AddCodeLine ("clc");
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@ -1823,7 +1788,7 @@ void g_addeqlocal (unsigned flags, int offs, unsigned long val)
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if (flags & CF_CONST) {
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g_getimmed (flags, val, 0);
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}
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ldyconst (offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("jsr laddeqysp");
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break;
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@ -1993,19 +1958,19 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
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void g_subeqlocal (unsigned flags, int offs, unsigned long val)
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void g_subeqlocal (unsigned flags, int Offs, unsigned long val)
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/* Emit -= for a local variable */
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{
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/* Calculate the true offset, check it, load it into Y */
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offs -= StackPtr;
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CheckLocalOffs (offs);
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Offs -= StackPtr;
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CheckLocalOffs (Offs);
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/* Check the size and determine operation */
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switch (flags & CF_TYPE) {
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case CF_CHAR:
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if (flags & CF_FORCECHAR) {
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ldyconst (offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("ldx #$00");
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if (flags & CF_CONST) {
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AddCodeLine ("lda (sp),y");
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@ -2031,7 +1996,7 @@ void g_subeqlocal (unsigned flags, int offs, unsigned long val)
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if (flags & CF_CONST) {
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g_getimmed (flags, val, 0);
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}
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ldyconst (offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("jsr subeqysp");
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break;
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@ -2039,7 +2004,7 @@ void g_subeqlocal (unsigned flags, int offs, unsigned long val)
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if (flags & CF_CONST) {
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g_getimmed (flags, val, 0);
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}
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ldyconst (offs);
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AddCodeLine ("ldy #$%02X", Offs);
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AddCodeLine ("jsr lsubeqysp");
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break;
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@ -2418,7 +2383,7 @@ void g_call (unsigned Flags, const char* Label, unsigned ArgSize)
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{
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if ((Flags & CF_FIXARGC) == 0) {
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/* Pass the argument count */
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ldyconst (ArgSize);
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AddCodeLine ("ldy #$%02X", ArgSize);
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}
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AddCodeLine ("jsr _%s", Label);
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StackPtr += ArgSize; /* callee pops args */
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@ -2433,7 +2398,7 @@ void g_callind (unsigned Flags, unsigned ArgSize, int Offs)
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/* Address is in a/x */
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if ((Flags & CF_FIXARGC) == 0) {
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/* Pass arg count */
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ldyconst (ArgSize);
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AddCodeLine ("ldy #$%02X", ArgSize);
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}
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AddCodeLine ("jsr callax");
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} else {
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@ -2481,26 +2446,56 @@ void g_falsejump (unsigned flags attribute ((unused)), unsigned label)
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static void mod_internal (int k, char* verb1, char* verb2)
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void g_drop (unsigned Space)
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/* Drop space allocated on the stack */
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{
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if (k <= 8) {
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AddCodeLine ("jsr %ssp%c", verb1, k + '0');
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} else {
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CheckLocalOffs (k);
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ldyconst (k);
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AddCodeLine ("jsr %ssp", verb2);
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if (Space > 255) {
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/* Inline the code since calling addysp repeatedly is quite some
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* overhead.
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*/
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AddCodeLine ("pha");
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AddCodeLine ("lda #$%02X", (unsigned char) Space);
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AddCodeLine ("clc");
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AddCodeLine ("adc sp");
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AddCodeLine ("sta sp");
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AddCodeLine ("lda #$%02X", (unsigned char) (Space >> 8));
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AddCodeLine ("adc sp+1");
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AddCodeLine ("sta sp+1");
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AddCodeLine ("pla");
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} else if (Space > 8) {
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AddCodeLine ("ldy #$%02X", Space);
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AddCodeLine ("jsr addysp");
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} else if (Space != 0) {
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AddCodeLine ("jsr incsp%u", Space);
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}
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}
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void g_space (int space)
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void g_space (int Space)
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/* Create or drop space on the stack */
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{
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if (space < 0) {
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mod_internal (-space, "inc", "addy");
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} else if (space > 0) {
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mod_internal (space, "dec", "suby");
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if (Space < 0) {
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/* This is actually a drop operation */
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g_drop (-Space);
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} else if (Space > 255) {
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/* Inline the code since calling subysp repeatedly is quite some
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* overhead.
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*/
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AddCodeLine ("pha");
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AddCodeLine ("lda sp");
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AddCodeLine ("sec");
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AddCodeLine ("sbc #$%02X", (unsigned char) Space);
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AddCodeLine ("sta sp");
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AddCodeLine ("lda sp+1");
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AddCodeLine ("sbc #$%02X", (unsigned char) (Space >> 8));
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AddCodeLine ("sta sp+1");
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AddCodeLine ("pla");
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} else if (Space > 8) {
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AddCodeLine ("ldy #$%02X", Space);
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AddCodeLine ("jsr subysp");
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} else if (Space != 0) {
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AddCodeLine ("jsr decsp%u", Space);
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}
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}
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@ -2754,7 +2749,7 @@ void g_or (unsigned flags, unsigned long val)
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if ((val & 0xFF) != 0) {
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AddCodeLine ("ora #$%02X", (unsigned char)val);
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}
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ldxconst (0xFF);
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AddCodeLine ("ldx #$FF");
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} else if (val != 0) {
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AddCodeLine ("ora #$%02X", (unsigned char)val);
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AddCodeLine ("pha");
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@ -2887,7 +2882,7 @@ void g_and (unsigned Flags, unsigned long Val)
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case CF_INT:
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if ((Val & 0xFFFF) != 0xFFFF) {
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if (Val <= 0xFF) {
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ldxconst (0);
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AddCodeLine ("ldx #$00");
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if (Val == 0) {
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AddCodeLine ("lda #$00");
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} else if (Val != 0xFF) {
|
||||
@ -2972,7 +2967,7 @@ void g_asr (unsigned flags, unsigned long val)
|
||||
if (val >= 8) {
|
||||
if (flags & CF_UNSIGNED) {
|
||||
AddCodeLine ("txa");
|
||||
ldxconst (0);
|
||||
AddCodeLine ("ldx #$00");
|
||||
} else {
|
||||
unsigned L = GetLocalLabel();
|
||||
AddCodeLine ("cpx #$80"); /* Sign bit into carry */
|
||||
@ -4239,7 +4234,7 @@ void g_initregister (unsigned Label, unsigned Reg, unsigned Size)
|
||||
{
|
||||
/* Register variables do always have less than 128 bytes */
|
||||
unsigned CodeLabel = GetLocalLabel ();
|
||||
ldxconst (Size-1);
|
||||
AddCodeLine ("ldx #$%02X", (unsigned char) (Size - 1));
|
||||
g_defcodelabel (CodeLabel);
|
||||
AddCodeLine ("lda %s,x", GetLabelName (CF_STATIC, Label, 0));
|
||||
AddCodeLine ("sta %s,x", GetLabelName (CF_REGVAR, Reg, 0));
|
||||
@ -4256,7 +4251,7 @@ void g_initauto (unsigned Label, unsigned Size)
|
||||
|
||||
CheckLocalOffs (Size);
|
||||
if (Size <= 128) {
|
||||
ldyconst (Size-1);
|
||||
AddCodeLine ("ldy #$%02X", Size-1);
|
||||
g_defcodelabel (CodeLabel);
|
||||
AddCodeLine ("lda %s,y", GetLabelName (CF_STATIC, Label, 0));
|
||||
AddCodeLine ("sta (sp),y");
|
||||
@ -4280,7 +4275,7 @@ void g_initstatic (unsigned InitLabel, unsigned VarLabel, unsigned Size)
|
||||
{
|
||||
if (Size <= 128) {
|
||||
unsigned CodeLabel = GetLocalLabel ();
|
||||
ldyconst (Size-1);
|
||||
AddCodeLine ("ldy #$%02X", Size-1);
|
||||
g_defcodelabel (CodeLabel);
|
||||
AddCodeLine ("lda %s,y", GetLabelName (CF_STATIC, InitLabel, 0));
|
||||
AddCodeLine ("sta %s,y", GetLabelName (CF_STATIC, VarLabel, 0));
|
||||
|
||||
@ -6,10 +6,10 @@
|
||||
/* */
|
||||
/* */
|
||||
/* */
|
||||
/* (C) 1998-2004 Ullrich von Bassewitz */
|
||||
/* Römerstrasse 52 */
|
||||
/* D-70794 Filderstadt */
|
||||
/* EMail: uz@cc65.org */
|
||||
/* (C) 1998-2009, Ullrich von Bassewitz */
|
||||
/* Roemerstrasse 52 */
|
||||
/* D-70794 Filderstadt */
|
||||
/* EMail: uz@cc65.org */
|
||||
/* */
|
||||
/* */
|
||||
/* This software is provided 'as-is', without any expressed or implied */
|
||||
@ -395,6 +395,9 @@ void g_truejump (unsigned flags, unsigned label);
|
||||
void g_falsejump (unsigned flags, unsigned label);
|
||||
/* Jump to label if zero flag set */
|
||||
|
||||
void g_drop (unsigned Space);
|
||||
/* Drop space allocated on the stack */
|
||||
|
||||
void g_space (int space);
|
||||
/* Create or drop space on the stack */
|
||||
|
||||
|
||||
@ -547,7 +547,7 @@ static void FunctionCall (ExprDesc* Expr)
|
||||
|
||||
/* If we have a pointer on stack, remove it */
|
||||
if (PtrOnStack) {
|
||||
g_space (- (int) sizeofarg (CF_PTR));
|
||||
g_drop (SIZEOF_PTR);
|
||||
pop (CF_PTR);
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user