[llvm-bugs] [Bug 34142] New: -msse4 -O0 segfault

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34142

            Bug ID: 34142
           Summary: -msse4 -O0 segfault
           Product: new-bugs
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hjl.tools at gmail.com
                CC: llvm-bugs at lists.llvm.org

[hjl at gnu-tools-1 pr81389]$ cat x.c
#include <nmmintrin.h>
#include <stdio.h>

int main(int argc, char* argv[]) {
        __m128i key128 = { ':' };
        const char data[] = "___0123456789:_:abcdefghijklmn";
        const char* ptr = argc < 100 ? data : argv[1];
        int idx = _mm_cmpestri(key128, 1,
                        *(const __m128i*)(ptr+3), 16, // don't require memory
align
                       
_SIDD_UBYTE_OPS|_SIDD_CMP_EQUAL_ORDERED|_SIDD_LEAST_SIGNIFICANT);
        printf("%zd\n", idx);
        return 0;
}
[hjl at gnu-tools-1 pr81389]$ clang -msse4 -O0 x.c
[hjl at gnu-tools-1 pr81389]$ ./a.out 
Segmentation fault (core dumped)
[hjl at gnu-tools-1 pr81389]$ clang -msse4 -O2 x.c
[hjl at gnu-tools-1 pr81389]$ ./a.out 
10
[hjl at gnu-tools-1 pr81389]$ 

"*(const __m128i*)(ptr+3)" is an incorrect cast.  GCC supports __m128i_u
for this:

[hjl at gnu-tools-1 pr81389]$ cat y.c
#include <nmmintrin.h>
#include <stdio.h>

int main(int argc, char* argv[]) {
        __m128i key128 = { ':' };
        const char data[] = "___0123456789:_:abcdefghijklmn";
        const char* ptr = argc < 100 ? data : argv[1];
        int idx = _mm_cmpestri(key128, 1,
                        *(const __m128i_u*)(ptr+3), 16, // don't require memory
align
                       
_SIDD_UBYTE_OPS|_SIDD_CMP_EQUAL_ORDERED|_SIDD_LEAST_SIGNIFICANT);
        printf("%zd\n", idx);
        return 0;
}
[hjl at gnu-tools-1 pr81389]$ gcc -msse4 -O0 y.c
[hjl at gnu-tools-1 pr81389]$ ./a.out 
10
[hjl at gnu-tools-1 pr81389]$ gcc -msse4 -O2 y.c
[hjl at gnu-tools-1 pr81389]$ ./a.out 
10
[hjl at gnu-tools-1 pr81389]$ clang  -msse4 -O0 y.c
y.c:9:12: error: unknown type name '__m128i_u'; did you mean '__m128i'?
                        *(const __m128i_u*)(ptr+3), 16, // don't requir...
                                ^~~~~~~~~
                                __m128i
/usr/bin/../lib64/clang/4.0.0/include/smmintrin.h:426:55: note: expanded from
      macro '_mm_cmpestri'
                                   (__v16qi)(__m128i)(B), (int)(LB), \
                                                      ^
/usr/bin/../lib64/clang/4.0.0/include/emmintrin.h:30:19: note: '__m128i'
      declared here
typedef long long __m128i __attribute__((__vector_size__(16)));
                  ^
1 error generated.
[hjl at gnu-tools-1 pr81389]$

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