AI_Slop/65816-llvm-mos
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This commit is contained in:
Scott Duensing 2026-05-07 20:44:53 -05:00
parent 15c7fa0db2
commit e84492a449
1 changed files with 33 additions and 0 deletions
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33
src/llvm/lib/Target/W65816/W65816RegisterInfo.cpp
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@ -290,6 +290,39 @@ bool W65816RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
BuildMI(*MI.getParent(), II, MI.getDebugLoc(), TII.get(W65816::TAX));
} else if (Dst == W65816::Y) {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(), TII.get(W65816::TAY));
} else {
// LDAfi with Dst = IMGn: regalloc allocated a Wide16 vreg to an
// IMG slot. LDA_StackRel only loaded into A; we must also store
// A to the IMG DP slot so subsequent `COPY $x = $imgN` (which
// expands to `ldx $D?`) reads the right value. Without this, the
// IMG slot stays stale and downstream reads silently get garbage
// — e.g., `dadd(1.5, 2.5) → 0x4010_0000_3000_3000` under full
// IMG-clobber because every cross-call spill reload of an IMG-
// assigned vreg fed stale prior data into the next computation.
int dstDP = -1;
switch (Dst) {
case W65816::IMG0: dstDP = 0xD0; break;
case W65816::IMG1: dstDP = 0xD2; break;
case W65816::IMG2: dstDP = 0xD4; break;
case W65816::IMG3: dstDP = 0xD6; break;
case W65816::IMG4: dstDP = 0xD8; break;
case W65816::IMG5: dstDP = 0xDA; break;
case W65816::IMG6: dstDP = 0xDC; break;
case W65816::IMG7: dstDP = 0xDE; break;
case W65816::IMG8: dstDP = 0xC0; break;
case W65816::IMG9: dstDP = 0xC2; break;
case W65816::IMG10: dstDP = 0xC4; break;
case W65816::IMG11: dstDP = 0xC6; break;
case W65816::IMG12: dstDP = 0xC8; break;
case W65816::IMG13: dstDP = 0xCA; break;
case W65816::IMG14: dstDP = 0xCC; break;
case W65816::IMG15: dstDP = 0xCE; break;
default: break;
}
if (dstDP >= 0) {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(W65816::STA_DP)).addImm(dstDP);
}
}
MI.eraseFromParent();
return true;