[llvm-bugs] [Bug 44589] New: _mm_extract_pi16 and _mm_insert_pi16 warn with -Wvector-conversion
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Jan 19 08:49:54 PST 2020
https://bugs.llvm.org/show_bug.cgi?id=44589
Bug ID: 44589
Summary: _mm_extract_pi16 and _mm_insert_pi16 warn with
-Wvector-conversion
Product: clang
Version: 9.0
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Headers
Assignee: unassignedclangbugs at nondot.org
Reporter: clang at evan.coeusgroup.com
CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
richard-llvm at metafoo.co.uk
Created attachment 23032
--> https://bugs.llvm.org/attachment.cgi?id=23032&action=edit
Patch to cast the vectors to __v4hi
When using either _mm_extract_pi16 or _mm_insert_pi16 with the
-Wvector-conversion warning enabled, clang will emit a diagnostic since the
builtins used by both functions expect a vector of 4 shorts, but __m64 is a
vector of 1 long long.
Here is a trivial test case:
#include <xmmintrin.h>
int16_t extract(__m64 a) {
return _mm_extract_pi16(a, 0);
}
__m64 insert(__m64 a, int d) {
return _mm_insert_pi16(a, d, 0);
}
A patch to simply cast the vectors to __v4hi instead of __m64 (which works for
me) is attached.
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