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Fixed a bug in the optimizer. Loads of X and Y from memory were sometimes

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replaced by loads of A with an immediate value (which is stored in said memory
location).


git-svn-id: svn://svn.cc65.org/cc65/trunk@3813 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2008-02-27 20:37:02 +00:00
parent 263b7863a3
commit a21bf773e1
1 changed files with 8 additions and 5 deletions
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11
src/cc65/coptind.c
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@@ -1312,8 +1312,9 @@ unsigned OptPrecalc (CodeSeg* S)
/* Get a pointer to the output registers of the insn */ /* Get a pointer to the output registers of the insn */
const RegContents* Out = &E->RI->Out; const RegContents* Out = &E->RI->Out;
/* Argument for LDA and flag */ /* Argument for LDn and flag */
const char* Arg = 0; const char* Arg = 0;
opc_t OPC = OP65_LDA;
/* Handle the different instructions */ /* Handle the different instructions */
switch (E->OPC) { switch (E->OPC) {
@@ -1327,15 +1328,17 @@ unsigned OptPrecalc (CodeSeg* S)
case OP65_LDX: case OP65_LDX:
if (E->AM != AM65_IMM && RegValIsKnown (Out->RegX)) { if (E->AM != AM65_IMM && RegValIsKnown (Out->RegX)) {
/* Result of load is known */ /* Result of load is known but register is X */
Arg = MakeHexArg (Out->RegX); Arg = MakeHexArg (Out->RegX);
OPC = OP65_LDX;
} }
break; break;
case OP65_LDY: case OP65_LDY:
if (E->AM != AM65_IMM && RegValIsKnown (Out->RegY)) { if (E->AM != AM65_IMM && RegValIsKnown (Out->RegY)) {
/* Result of load is known */ /* Result of load is known but register is Y */
Arg = MakeHexArg (Out->RegY); Arg = MakeHexArg (Out->RegY);
OPC = OP65_LDY;
} }
break; break;
@@ -1379,7 +1382,7 @@ unsigned OptPrecalc (CodeSeg* S)
/* Check if we have to replace the insn by LDA */ /* Check if we have to replace the insn by LDA */
if (Arg) { if (Arg) {
CodeEntry* X = NewCodeEntry (OP65_LDA, AM65_IMM, Arg, 0, E->LI); CodeEntry* X = NewCodeEntry (OPC, AM65_IMM, Arg, 0, E->LI);
CS_InsertEntry (S, X, I+1); CS_InsertEntry (S, X, I+1);
CS_DelEntry (S, I); CS_DelEntry (S, I);
++Changes; ++Changes;