https://llvm.org/bugs/show_bug.cgi?id=28510
Bug ID: 28510
Summary: SSE compare float to integer _mm_comige_ss family of
instructions has changed behavior
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: juj...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
STR:
#include <xmmintrin.h>
#include <math.h>
#include <stdio.h>
int main()
{
__m128 a = _mm_set1_ps(42.f);
__m128 b = _mm_set1_ps(NAN);
int equal = _mm_comieq_ss(a, b);
printf("equal: %d\n", equal);
}
Clang/LLVM <= 3.8, GCCs and Visual Studios will print "equal: 1" as expected
(although unintuitive), but the current Clang trunk will print "equal: 0"
instead.
We are currently discussing this change in behavior in
https://github.com/kripken/emscripten/issues/4435 as well.
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