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[Support] Refactor getN1Bits so it does not work around any g++ bug #78933

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Merged
merged 1 commit into from
May 26, 2024
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[Support] Refactor getN1Bits so it does not work around any g++ bug #78933

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7 changes: 2 additions & 5 deletions llvm/include/llvm/Support/Discriminator.h
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Original file line number Diff line number Diff line change
Expand Up @@ -121,12 +121,9 @@ static inline unsigned getBaseFSBitEnd() {
}

// Set bits in range of [0 .. n] to 1. Used in FS Discriminators.
static inline unsigned getN1Bits(int N) {
// Work around the g++ bug that folding "(1U << (N + 1)) - 1" to 0.
if (N == 31)
return 0xFFFFFFFF;
static inline unsigned getN1Bits(unsigned N) {
assert((N < 32) && "N is invalid");
return (1U << (N + 1)) - 1;
return 0xFFFFFFFF >> (31 - N);
}

} // namespace llvm
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