https://bugs.llvm.org/show_bug.cgi?id=49716
Bug ID: 49716
Summary: clang segfault at -O2 in C mode, reduced test case
included
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 24690
--> https://bugs.llvm.org/attachment.cgi?id=24690&action=edit
Non-reduced, un-preprocessed source
Here is a reduced test case:
#include <stdlib.h>
typedef union {
int16_t i16 __attribute__((__vector_size__(32)));
int32_t i32 __attribute__((__vector_size__(32)));
} simde__m256i_private;
simde__m256i_private simde__m256i_to_private();
int simde_mm256_madd_epi16() {
simde__m256i_private r_, a_ = simde__m256i_to_private(),
b_ = simde__m256i_to_private();
for (size_t i = 0; i < sizeof sizeof(r_); i += 2)
r_.i32[i] = a_.i16[i] * b_.i16[i] + a_.i16[i + 1] * b_.i16[i + 1];
simde__m256i_from_private(r_);
}
Compile with -O2 using clang (clang++ works) on x86_64. Godbolt link:
https://godbolt.org/z/71o5hdY4h
The problem only manifests in my codebase with clang 12, but this test case
seems to reliably reproduce the issue in earlier versions as well (back to 7 on
godbolt).
I'm also attaching the original (non-reduced) source. Please let me know if
you need any additional information.
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