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Added info about changed leaa0sp and leaaxsp. Rewrote g_leasp to cope with 16

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stack offsets, because it's rather easy in this case.


git-svn-id: svn://svn.cc65.org/cc65/trunk@4093 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-08-31 12:41:38 +00:00
parent db69c202a4
commit 7064aafab9
3 changed files with 65 additions and 28 deletions
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80
src/cc65/codegen.c
View File

@ -921,38 +921,63 @@ void g_getind (unsigned flags, unsigned offs)
void g_leasp (int offs)
void g_leasp (int Offs)
/* Fetch the address of the specified symbol into the primary register */
{
/* Calculate the offset relative to sp */
offs -= StackPtr;
/* Get low and high byte */
unsigned char Lo = (unsigned char) Offs;
unsigned char Hi = (unsigned char) (Offs >> 8);
/* For value 0 we do direct code */
if (offs == 0) {
AddCodeLine ("lda sp");
AddCodeLine ("ldx sp+1");
} else {
if (IS_Get (&CodeSizeFactor) < 300) {
ldaconst (offs); /* Load A with offset value */
AddCodeLine ("jsr leaasp"); /* Load effective address */
} else {
unsigned L = GetLocalLabel ();
if ((CPUIsets[CPU] & CPU_ISET_65SC02) != 0 && offs == 1) {
AddCodeLine ("lda sp");
AddCodeLine ("ldx sp+1");
AddCodeLine ("ina");
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("inx");
} else {
ldaconst (offs);
AddCodeLine ("ldx sp+1");
AddCodeLine ("clc");
AddCodeLine ("adc sp");
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
/* Calculate the offset relative to sp */
Offs -= StackPtr;
/* Generate code */
if (Lo == 0) {
if (Hi <= 3) {
AddCodeLine ("lda sp");
AddCodeLine ("ldx sp+1");
while (Hi--) {
AddCodeLine ("inx");
}
} else {
AddCodeLine ("lda sp+1");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", Hi);
AddCodeLine ("tax");
AddCodeLine ("lda sp");
}
} else if (Hi == 0) {
/* 8 bit offset */
if (IS_Get (&CodeSizeFactor) < 200) {
/* 8 bit offset with subroutine call */
AddCodeLine ("lda #$%02X", Lo);
AddCodeLine ("jsr leaa0sp");
} else {
/* 8 bit offset inlined */
unsigned L = GetLocalLabel ();
AddCodeLine ("lda sp");
AddCodeLine ("ldx sp+1");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", Lo);
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
g_defcodelabel (L);
}
} else if (IS_Get (&CodeSizeFactor) < 170) {
/* Full 16 bit offset with subroutine call */
AddCodeLine ("lda #$%02X", Lo);
AddCodeLine ("ldx #$%02X", Hi);
AddCodeLine ("jsr leaaxsp");
} else {
/* Full 16 bit offset inlined */
AddCodeLine ("lda sp");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", (unsigned char) Offs);
AddCodeLine ("pha");
AddCodeLine ("lda sp+1");
AddCodeLine ("adc #$%02X", (unsigned char) (Offs >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
}
}
@ -989,7 +1014,8 @@ void g_leavariadic (int Offs)
AddCodeLine ("inx");
g_defcodelabel (L);
} else {
AddCodeLine ("jsr leaasp");
AddCodeLine ("ldx #$00");
AddCodeLine ("jsr leaaxsp");
}
/* Add the offset to the primary */

3
src/cc65/codeinfo.c
View File

@ -162,7 +162,8 @@ static const FuncInfo FuncInfoTable[] = {
{ "ldeaxi", REG_AX, REG_EAXY | REG_PTR1 },
{ "ldeaxidx", REG_AXY, REG_EAXY | REG_PTR1 },
{ "ldeaxysp", REG_Y, REG_EAXY },
{ "leaasp", REG_A, REG_AX },
{ "leaa0sp", REG_A, REG_AX },
{ "leaaxsp", REG_AX, REG_AX },
{ "lsubeq", REG_EAXY|REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
{ "lsubeq0sp", REG_EAX, REG_EAXY },
{ "lsubeq1", REG_Y | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },

10
src/cc65/coptsize.c
View File

@ -153,6 +153,16 @@ static const CallDesc CallTable [] = {
},
F_NONE,
"ldeax0sp"
},{
"leaaxsp",
{
/* A X Y SRegLo */
UNKNOWN_REGVAL, 0, UNKNOWN_REGVAL, UNKNOWN_REGVAL,
/* SRegHi Ptr1Lo Ptr1Hi Tmp1 */
UNKNOWN_REGVAL, UNKNOWN_REGVAL, UNKNOWN_REGVAL, UNKNOWN_REGVAL
},
F_NONE,
"leaa0sp"
},{
"lsubeq",
{