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x86: fix issue with casting in Cvtf2i

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UBSAN flags this operation because it detects that arg is being cast directly
to an unsigned type, argBits. this patch fixes this by first casting the
value to a signed int type, then reintrepreting the raw bits of the signed
int into argBits.
This commit is contained in:
Tony Gutierrez 2016-11-21 15:35:56 -05:00
parent 29d38e7576
commit 0799600686
1 changed files with 4 additions and 2 deletions
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6
src/arch/x86/isa/microops/mediaop.isa
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@ -1220,9 +1220,11 @@ let {{
}
if (destSize == 4) {
argBits = (uint32_t)arg;
int32_t i_arg = (int32_t)arg;
argBits = *((uint32_t*)&i_arg);
} else {
argBits = (uint64_t)arg;
int64_t i_arg = (int64_t)arg;
argBits = *((uint64_t*)&i_arg);
}
int destHiIndex = destStart + (i + 1) * destSizeBits - 1;
int destLoIndex = destStart + (i + 0) * destSizeBits;