diff options
Diffstat (limited to 'gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-52.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-52.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-52.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-52.c new file mode 100644 index 0000000..9e605ac --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-52.c @@ -0,0 +1,30 @@ +/* { dg-options "-O2 -fdump-tree-dse-details -fno-tree-fre -fdump-tree-optimized" } */ + +/* PR tree-optimization/87901 */ + +char z[32]; +void foo1(void) +{ + char z1[17]; + char z2[24]; + __builtin_memset (z1, 0, 17); + __builtin_memcpy (z, z1, 17); + __builtin_memset (z2, 0, 24); + __builtin_memcpy (z+8, z2, 24); +} + +/* we should get: + MEM <unsigned char[8]> [(char * {ref-all})&z] = {}; + MEM <unsigned char[24]> [(char * {ref-all})&z + 8B] = {}; + after DSE; trimming the first memset to z (which was memcpy) to 8 bytes + from the original 17. + and not have a [17] in the IR after DSE. + The two memset to z1/z2 will also be removed. + */ +/* { dg-final { scan-tree-dump-not "\\\[17\\\]" "optimized" } } */ +/* { dg-final { scan-tree-dump "\\\[8\\\]" "dse1" } } */ + +/* { dg-final { scan-tree-dump-times "Trimming statement " 1 "dse1" } } */ +/* { dg-final { scan-tree-dump-times "Deleted dead call:" 2 "dse1" } } */ + + |