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Suppress useless -Wshadow warning when using _mm* macros from emmintrin.h 

Fixes <rdar://problem/10679282>.

I'm not completely satisfied with this patch.  Sprinkling "diagnostic ignored"
_Pragmas throughout this file is gross, but I couldn't suppress
it for the entire file.

llvm-svn: 192143
This commit is contained in:
Ted Kremenek 2013-10-07 23:51:11 +00:00
parent db78c7049e
commit 854cc293a7
2 changed files with 22 additions and 0 deletions
clang
lib/Headers
emmintrin.h
test/Sema
warn-shadow.c

12
clang/lib/Headers/emmintrin.h
View File

@ -826,7 +826,9 @@ _mm_xor_si128(__m128i __a, __m128i __b)
}
#define _mm_slli_si128(a, count) __extension__ ({ \
_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wshadow\""); \
__m128i __a = (a); \
_Pragma("clang diagnostic pop"); \
(__m128i)__builtin_ia32_pslldqi128(__a, (count)*8); })
static __inline__ __m128i __attribute__((__always_inline__, __nodebug__))
@ -891,7 +893,9 @@ _mm_sra_epi32(__m128i __a, __m128i __count)
#define _mm_srli_si128(a, count) __extension__ ({ \
_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wshadow\""); \
__m128i __a = (a); \
_Pragma("clang diagnostic pop"); \
(__m128i)__builtin_ia32_psrldqi128(__a, (count)*8); })
static __inline__ __m128i __attribute__((__always_inline__, __nodebug__))
@ -1280,20 +1284,26 @@ _mm_movemask_epi8(__m128i __a)
}
#define _mm_shuffle_epi32(a, imm) __extension__ ({ \
_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wshadow\""); \
__m128i __a = (a); \
_Pragma("clang diagnostic pop"); \
(__m128i)__builtin_shufflevector((__v4si)__a, (__v4si) _mm_set1_epi32(0), \
(imm) & 0x3, ((imm) & 0xc) >> 2, \
((imm) & 0x30) >> 4, ((imm) & 0xc0) >> 6); })
#define _mm_shufflelo_epi16(a, imm) __extension__ ({ \
_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wshadow\""); \
__m128i __a = (a); \
_Pragma("clang diagnostic pop"); \
(__m128i)__builtin_shufflevector((__v8hi)__a, (__v8hi) _mm_set1_epi16(0), \
(imm) & 0x3, ((imm) & 0xc) >> 2, \
((imm) & 0x30) >> 4, ((imm) & 0xc0) >> 6, \
4, 5, 6, 7); })
#define _mm_shufflehi_epi16(a, imm) __extension__ ({ \
_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wshadow\""); \
__m128i __a = (a); \
_Pragma("clang diagnostic pop"); \
(__m128i)__builtin_shufflevector((__v8hi)__a, (__v8hi) _mm_set1_epi16(0), \
0, 1, 2, 3, \
4 + (((imm) & 0x03) >> 0), \
@ -1386,8 +1396,10 @@ _mm_movemask_pd(__m128d __a)
}
#define _mm_shuffle_pd(a, b, i) __extension__ ({ \
_Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wshadow\""); \
__m128d __a = (a); \
__m128d __b = (b); \
_Pragma("clang diagnostic pop"); \
__builtin_shufflevector(__a, __b, (i) & 1, (((i) & 2) >> 1) + 2); })
static __inline__ __m128 __attribute__((__always_inline__, __nodebug__))

10
clang/test/Sema/warn-shadow.c
View File

@ -1,5 +1,7 @@
// RUN: %clang_cc1 -verify -fsyntax-only -fblocks -Wshadow %s
#include <emmintrin.h>
int i; // expected-note 3 {{previous declaration is here}}
void foo() {
@ -59,3 +61,11 @@ void rdar8883302() {
void test8() {
int bob; // expected-warning {{declaration shadows a variable in the global scope}}
}
// Test that using two macros from emmintrin do not cause a
// useless -Wshadow warning.
void rdar10679282() {
__m128i qf = _mm_setzero_si128();
qf = _mm_slli_si128(_mm_add_epi64(qf, _mm_srli_si128(qf, 8)), 8); // no-warning
(void) qf;
}