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DebugInfo: misc fixes. #73

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Merged
hexratcc merged 1 commit into from
Nov 10, 2026
Merged

DebugInfo: misc fixes. #73

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9 changes: 7 additions & 2 deletions src/backend/pass/emit/x86/x86_lower_ops.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1038,9 +1038,14 @@ namespace rat {
case Opcode::FPTrunc:
fstpSse(vregFor(n), opWidth(n->getType()), x);
return;
case Opcode::SIToFP:
fild(x87SlotOf(n), s);
case Opcode::SIToFP: {
// fild reads all 64 bits, a narrower source loaded from memory is zero extended
VReg wide = fresh(detail::kGp);
mov(wide, s);
signExtBits(wide, intBits(st));
fild(x87SlotOf(n), wide);
return;
}
case Opcode::UIToFP:
emitUIntToX87(n, s, intBits(st));
return;
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10 changes: 10 additions & 0 deletions src/compiler/test/correctness/custom/x87_from_narrow_int_noopt.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
// expect: 1
// passes:

// a negative int read back from memory, converted to long double
long double widen(int s) {
int* p = &s;
return *p;
}

int main(void) { return widen(-1) == -1.0L; }
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