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Code improvements

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4081 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-08-29 21:58:06 +00:00
parent 7f7dc69290
commit b098d8045e
2 changed files with 28 additions and 7 deletions
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18
src/cc65/codegen.c
View File

@ -2855,7 +2855,9 @@ void g_and (unsigned Flags, unsigned long Val)
case CF_CHAR: case CF_CHAR:
if (Flags & CF_FORCECHAR) { if (Flags & CF_FORCECHAR) {
if ((Val & 0xFF) != 0xFF) { if ((Val & 0xFF) == 0x00) {
AddCodeLine ("lda #$00");
} else if ((Val & 0xFF) != 0xFF) {
AddCodeLine ("and #$%02X", (unsigned char)Val); AddCodeLine ("and #$%02X", (unsigned char)Val);
} }
return; return;
@ -2866,26 +2868,30 @@ void g_and (unsigned Flags, unsigned long Val)
if (Val <= 0xFF) { if (Val <= 0xFF) {
ldxconst (0); ldxconst (0);
if (Val == 0) { if (Val == 0) {
ldaconst (0); AddCodeLine ("lda #$00");
} else if (Val != 0xFF) { } else if (Val != 0xFF) {
AddCodeLine ("and #$%02X", (unsigned char)Val); AddCodeLine ("and #$%02X", (unsigned char)Val);
} }
} else if ((Val & 0xFF00) == 0xFF00) { } else if ((Val & 0xFFFF) == 0xFF00) {
AddCodeLine ("lda #$00");
} else if ((Val & 0xFF00) == 0xFF00) {
AddCodeLine ("and #$%02X", (unsigned char)Val); AddCodeLine ("and #$%02X", (unsigned char)Val);
} else if ((Val & 0x00FF) == 0x0000) { } else if ((Val & 0x00FF) == 0x0000) {
AddCodeLine ("txa"); AddCodeLine ("txa");
AddCodeLine ("and #$%02X", (unsigned char)(Val >> 8)); AddCodeLine ("and #$%02X", (unsigned char)(Val >> 8));
AddCodeLine ("tax"); AddCodeLine ("tax");
ldaconst (0); AddCodeLine ("lda #$00");
} else { } else {
AddCodeLine ("tay"); AddCodeLine ("tay");
AddCodeLine ("txa"); AddCodeLine ("txa");
AddCodeLine ("and #$%02X", (unsigned char)(Val >> 8)); AddCodeLine ("and #$%02X", (unsigned char)(Val >> 8));
AddCodeLine ("tax"); AddCodeLine ("tax");
AddCodeLine ("tya"); AddCodeLine ("tya");
if ((Val & 0x00FF) != 0x00FF) { if ((Val & 0x00FF) == 0x0000) {
AddCodeLine ("lda #$00");
} else if ((Val & 0x00FF) != 0x00FF) {
AddCodeLine ("and #$%02X", (unsigned char)Val); AddCodeLine ("and #$%02X", (unsigned char)Val);
} }
} }
} }
return; return;

17
src/cc65/coptind.c
View File

@ -1845,8 +1845,9 @@ unsigned OptPrecalc (CodeSeg* S)
/* Get next entry */ /* Get next entry */
CodeEntry* E = CS_GetEntry (S, I); CodeEntry* E = CS_GetEntry (S, I);
/* Get a pointer to the output registers of the insn */ /* Get pointers to the input and output registers of the insn */
const RegContents* Out = &E->RI->Out; const RegContents* Out = &E->RI->Out;
const RegContents* In = &E->RI->In;
/* Argument for LDn and flag */ /* Argument for LDn and flag */
const char* Arg = 0; const char* Arg = 0;
@ -1894,9 +1895,16 @@ unsigned OptPrecalc (CodeSeg* S)
/* AND with 0xFF, remove */ /* AND with 0xFF, remove */
CS_DelEntry (S, I); CS_DelEntry (S, I);
++Changes; ++Changes;
} else if (CE_IsKnownImm (E, 0x00)) {
/* AND with 0x00, replace by lda #$00 */
Arg = MakeHexArg (0x00);
} else if (RegValIsKnown (Out->RegA)) { } else if (RegValIsKnown (Out->RegA)) {
/* Accu AND zp with known contents */ /* Accu AND zp with known contents */
Arg = MakeHexArg (Out->RegA); Arg = MakeHexArg (Out->RegA);
} else if (In->RegA == 0xFF) {
/* AND but A contains 0xFF - replace by lda */
CE_ReplaceOPC (E, OP65_LDA);
++Changes;
} }
break; break;
@ -1905,9 +1913,16 @@ unsigned OptPrecalc (CodeSeg* S)
/* ORA with zero, remove */ /* ORA with zero, remove */
CS_DelEntry (S, I); CS_DelEntry (S, I);
++Changes; ++Changes;
} else if (CE_IsKnownImm (E, 0xFF)) {
/* ORA with 0xFF, replace by lda #$ff */
Arg = MakeHexArg (0xFF);
} else if (RegValIsKnown (Out->RegA)) { } else if (RegValIsKnown (Out->RegA)) {
/* Accu AND zp with known contents */ /* Accu AND zp with known contents */
Arg = MakeHexArg (Out->RegA); Arg = MakeHexArg (Out->RegA);
} else if (In->RegA == 0) {
/* ORA but A contains 0x00 - replace by lda */
CE_ReplaceOPC (E, OP65_LDA);
++Changes;
} }
break; break;