6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2025-01-06 22:31:52 +00:00
Code Issues Projects Releases Wiki Activity

Quick fix for Issue #1071.

Browse Source
This commit is contained in:
acqn 2020-07-04 13:32:28 +08:00 committed by Oliver Schmidt
parent 17c5504129
commit 286da30a26
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/cc65/coptstop.c
View File

@ -145,6 +145,9 @@ struct StackOpData {
/* Freedom of registers inside the sequence */
unsigned UsedRegs; /* Registers used */
/* Whether the rhs is changed multiple times */
int RhsMultiChg;
/* Register load information for lhs and rhs */
LoadInfo Lhs;
LoadInfo Rhs;
@ -1972,6 +1975,7 @@ static void ResetStackOpData (StackOpData* Data)
Data->ZPUsage = REG_NONE;
Data->ZPChanged = REG_NONE;
Data->UsedRegs = REG_NONE;
Data->RhsMultiChg = 0;
ClearLoadInfo (&Data->Lhs);
ClearLoadInfo (&Data->Rhs);
@ -2092,6 +2096,10 @@ static int PreCondOk (StackOpData* D)
}
}
}
if (D->RhsMultiChg && (D->OptFunc->Flags & OP_RHS_REMOVE_DIRECT) != 0) {
/* Cannot optimize */
break;
}
Passed = 1;
} while (0);
@ -2188,6 +2196,8 @@ unsigned OptStackOps (CodeSeg* S)
int OldEntryCount; /* Old number of entries */
unsigned Used; /* What registers would be used */
unsigned PushedRegs; /* Track if the same regs are used after the push */
int RhsALoadIndex; /* Track if rhs is changed more than once */
int RhsXLoadIndex; /* Track if rhs is changed more than once */
enum {
Initialize,
@ -2335,6 +2345,10 @@ unsigned OptStackOps (CodeSeg* S)
}
/* Memorize the old rhs load indices before refreshing them */
RhsALoadIndex = Data.Rhs.A.LoadIndex;
RhsXLoadIndex = Data.Rhs.X.LoadIndex;
/* Track register usage */
Used = TrackLoads (&Data.Rhs, &Data.Lhs, Data.Code, I);
Data.ZPUsage |= (E->Use | E->Chg);
@ -2358,6 +2372,16 @@ unsigned OptStackOps (CodeSeg* S)
}
PushedRegs &= ~E->Chg;
}
/* Check if rhs is changed again after the push */
if ((RhsALoadIndex != Data.Lhs.A.LoadIndex &&
RhsALoadIndex != Data.Rhs.A.LoadIndex) ||
(RhsXLoadIndex != Data.Lhs.X.LoadIndex &&
RhsXLoadIndex != Data.Rhs.X.LoadIndex)) {
/* This will disable those sub-opts that require removing
** the rhs as they can't handle such cases correctly.
*/
Data.RhsMultiChg = 1;
}
break;
case FoundOp: