diff options
Diffstat (limited to 'gcc/testsuite/gcc.dg/memcmp-4.c')
-rw-r--r-- | gcc/testsuite/gcc.dg/memcmp-4.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/memcmp-4.c b/gcc/testsuite/gcc.dg/memcmp-4.c new file mode 100644 index 0000000..bbac719 --- /dev/null +++ b/gcc/testsuite/gcc.dg/memcmp-4.c @@ -0,0 +1,81 @@ +/* PR middle-end/78257 - missing memcmp optimization with constant arrays + { dg-do compile } + { dg-options "-O -Wall -fdump-tree-optimized" } */ + +typedef __INT8_TYPE__ int8_t; +typedef __INT16_TYPE__ int16_t; +typedef __INT32_TYPE__ int32_t; +typedef __SIZE_TYPE__ size_t; + +extern int memcmp (const void*, const void*, size_t); + +/* Verify that initializers for flexible array members are handled + correctly. */ + +struct Si16_x +{ + int16_t n, a[]; +}; + +const struct Si16_x si16_4 = + { + 0x1112, { 0x2122, 0x3132, 0x4142 } + }; + +const char si16_4_rep[] = + { + 0x12, 0x11, 0x22, 0x21, 0x32, 0x31, 0x42, 0x41 + }; + +void eq_si16_x (void) +{ + int n = 0, b = sizeof si16_4_rep; + const char *p = (const char*)&si16_4, *q = si16_4_rep; + + n += memcmp (p, q, b); + n += memcmp (p + 1, q + 1, b - 1); + n += memcmp (p + 2, q + 2, b - 2); + n += memcmp (p + 3, q + 3, b - 3); + n += memcmp (p + 4, q + 4, b - 4); + n += memcmp (p + 5, q + 5, b - 5); + n += memcmp (p + 6, q + 6, b - 6); + n += memcmp (p + 7, q + 7, b - 7); + n += memcmp (p + 8, q + 8, b - 8); + + p = (const char*)&si16_4.n; + + n += memcmp (p, q, b); + n += memcmp (p + 1, q + 1, b - 1); + n += memcmp (p + 2, q + 2, b - 2); + n += memcmp (p + 3, q + 3, b - 3); + n += memcmp (p + 4, q + 4, b - 4); + n += memcmp (p + 5, q + 5, b - 5); + n += memcmp (p + 6, q + 6, b - 6); + n += memcmp (p + 7, q + 7, b - 7); + n += memcmp (p + 8, q + 8, b - 8); + + p = (const char*)si16_4.a; + q = si16_4_rep + 2; + + n += memcmp (p, q, b - 2); + n += memcmp (p + 1, q + 1, b - 3); + n += memcmp (p + 2, q + 2, b - 4); + n += memcmp (p + 3, q + 3, b - 5); + n += memcmp (p + 4, q + 4, b - 6); + n += memcmp (p + 5, q + 5, b - 7); + n += memcmp (p + 6, q + 6, b - 8); + + p = (const char*)&si16_4.a[1]; + q = si16_4_rep + 4; + + n += memcmp (p, q, b - 4); + n += memcmp (p + 1, q + 1, b - 5); + n += memcmp (p + 2, q + 2, b - 6); + n += memcmp (p + 3, q + 3, b - 7); + n += memcmp (p + 4, q + 4, b - 8); + + if (n != 0) + __builtin_abort (); +} + +/* { dg-final { scan-tree-dump-not "abort" "optimized" } } */ |