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Avoid overflowing a signed integer which triggers undefined behaviour.
Overflowing an unsigned integer is fine and behaves as you would expect. Also fix a pasto, allowing SignExtend64 to take a 64-bit argument. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100517 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -459,14 +459,14 @@ inline int64_t abs64(int64_t x) {
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/// SignExtend32 - Sign extend B-bit number x to 32-bit int.
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/// SignExtend32 - Sign extend B-bit number x to 32-bit int.
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/// Usage int32_t r = SignExtend32<5>(x);
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/// Usage int32_t r = SignExtend32<5>(x);
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template <unsigned B> inline int32_t SignExtend32(int32_t x) {
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template <unsigned B> inline int32_t SignExtend32(uint32_t x) {
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return (x << (32 - B)) >> (32 - B);
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return int32_t(x << (32 - B)) >> (32 - B);
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}
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}
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/// SignExtend64 - Sign extend B-bit number x to 64-bit int.
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/// SignExtend64 - Sign extend B-bit number x to 64-bit int.
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/// Usage int64_t r = SignExtend64<5>(x);
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/// Usage int64_t r = SignExtend64<5>(x);
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template <unsigned B> inline int64_t SignExtend64(int32_t x) {
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template <unsigned B> inline int64_t SignExtend64(uint64_t x) {
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return (x << (64 - B)) >> (64 - B);
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return int64_t(x << (64 - B)) >> (64 - B);
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}
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}
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} // End llvm namespace
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} // End llvm namespace
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