https://llvm.org/bugs/show_bug.cgi?id=26832
Bug ID: 26832
Summary: __m64 not passed according to x86-64 ABI
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: jykni...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Test program:
#include <mmintrin.h>
__m64 glob;
void xxxx(__m64 x) {
glob = x;
}
psABI says "Arguments of types float, double, _Decimal32, _Decimal64 and __m64
are in class SSE." That's pretty clear.
GCC, at least from 4.4.7 through 6 (the versions available at gcc.godbolt.org),
follows the psABI:
movq %xmm0, glob(%rip)
ret
Clang does not:
movq %rdi, glob(%rip)
retq
Clang claims it's doing so for gcc compatibility in a comment:
// gcc passes <1 x double> in memory. :(
// gcc passes <1 x long long> as INTEGER.
but that's not actually true (now; don't know about when the comment was
written)
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