bslathi19/cc65
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Add an optimization step that removes compare instructions preceeding an RTS.

Browse Source 
Since nothing is passed back in the flags, these instructions have no effect.
Fixes #2025.
This commit is contained in:
Kugel Fuhr
2025-06-24 18:02:24 +02:00
parent c520455b2b
commit c0a1b1b887
3 changed files with 45 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
src/cc65/codeopt.c
View File

@@ -136,6 +136,7 @@ static OptFunc DOptCmp5 = { OptCmp5, "OptCmp5", 100, 0,
static OptFunc DOptCmp7 = { OptCmp7, "OptCmp7", 85, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp8 = { OptCmp8, "OptCmp8", 50, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp9 = { OptCmp9, "OptCmp9", 85, 0, 0, 0, 0, 0 };
static OptFunc DOptCmp10 = { OptCmp10, "OptCmp10", 33, 0, 0, 0, 0, 0 };
static OptFunc DOptComplAX1 = { OptComplAX1, "OptComplAX1", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptCondBranch1 = { OptCondBranch1, "OptCondBranch1", 80, 0, 0, 0, 0, 0 };
static OptFunc DOptCondBranch2 = { OptCondBranch2, "OptCondBranch2", 40, 0, 0, 0, 0, 0 };
@@ -251,6 +252,7 @@ static OptFunc* OptFuncs[] = {
&DOptBranchDist,
&DOptBranchDist2,
&DOptCmp1,
&DOptCmp10,
&DOptCmp2,
&DOptCmp3,
&DOptCmp4,
@@ -729,6 +731,7 @@ static unsigned RunOptGroup3 (CodeSeg* S)
C += RunOptFunc (S, &DOptCondBranch3, 1);
C += RunOptFunc (S, &DOptCondBranchC, 1);
C += RunOptFunc (S, &DOptRTSJumps1, 1);
C += RunOptFunc (S, &DOptCmp10, 1); /* After OptRTSJumps1 */
C += RunOptFunc (S, &DOptBoolCmp, 1);
C += RunOptFunc (S, &DOptBoolTrans, 1);
C += RunOptFunc (S, &DOptBNegA2, 1); /* After OptCondBranch's */