| /* PR tree-optimization/80933 - redundant bzero/bcopy calls not eliminated |
| { dg-do compile } |
| { dg-options "-O1 -Wall -fdump-tree-lower" } */ |
| |
| void f0 (void *dst, const void *src, unsigned n) |
| { |
| /* Bcopy(src, dst, ...) corresponds to memmove(dst, src, ...), |
| with the first two arguments transposed, not memcpy. */ |
| __builtin_bcopy (src, dst, n); |
| } |
| |
| void f1 (void *p, const void *q, unsigned n) |
| { |
| /* A call with zero size should be eliminated. */ |
| __builtin_bcopy (q, p, 0); |
| } |
| |
| int f2 (const void *p, const void *q, unsigned n) |
| { |
| return __builtin_bcmp (p, q, n); |
| } |
| |
| int f3 (const void *p, const void *q) |
| { |
| /* A call with zero size should be folded into 0. */ |
| return __builtin_bcmp (p, q, 0); |
| } |
| |
| int f4 (const void *p, unsigned n) |
| { |
| /* A call with the same argument should also be folded into 0. */ |
| return __builtin_bcmp (p, p, n); |
| } |
| |
| void f5 (void *p, unsigned n) |
| { |
| __builtin_bzero (p, n); |
| } |
| |
| void f6 (void *p) |
| { |
| /* A call with zero size should be eliminated. */ |
| __builtin_bzero (p, 0); |
| } |
| |
| /* Verify that calls to bcmp, bcopy, and bzero have all been removed |
| and one of each replaced with memcmp, memmove, and memset, respectively. |
| The remaining three should be eliminated. |
| { dg-final { scan-tree-dump-not "bcmp|bcopy|bzero" "lower" } } |
| { dg-final { scan-tree-dump-times "memcmp|memmove|memset" 3 "lower" } } |
| |
| Verify that the bcopy to memmove transformation correctly transposed |
| the source and destination pointer arguments. |
| { dg-final { scan-tree-dump-times "memmove \\(dst, src" 1 "lower" } } */ |