| /* 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:" } } */ |
