Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/gcc.dg/zero_bits_compound-1.c @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
---|---|
date | Thu, 13 Feb 2020 11:34:05 +0900 |
parents | 84e7813d76e9 |
children |
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/* Test whether an AND mask or'ed with the know zero bits that equals a mode mask is a candidate for zero extendion. */ /* Note: This test requires that char, int and long have different sizes and the target has a way to do 32 -> 64 bit zero extension other than AND. */ /* { dg-do compile { target i?86-*-* x86_64-*-* s390*-*-* } } */ /* { dg-require-effective-target lp64 } */ /* { dg-options "-O3 -dP" } */ unsigned long foo (unsigned char c) { unsigned long l; unsigned int i; i = ((unsigned int)c) << 8; i |= ((unsigned int)c) << 20; asm volatile ("":::); i = i & 0x0ff0ff00; asm volatile ("":::); l = (unsigned long)i; return l; } unsigned long bar (unsigned char c) { unsigned long l; unsigned int i; i = ((unsigned int)c) << 8; i |= ((unsigned int)c) << 20; asm volatile ("":::); i = i & 0x0ffffff0; asm volatile ("":::); l = (unsigned long)i; return l; } /* Check that no pattern containing an AND expression was used. */ /* { dg-final { scan-assembler-not "\\(and:" } } */