diff options
Diffstat (limited to 'gcc/testsuite/gcc.target/powerpc/pure-builtin-redundant-load.c')
| -rw-r--r-- | gcc/testsuite/gcc.target/powerpc/pure-builtin-redundant-load.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.target/powerpc/pure-builtin-redundant-load.c b/gcc/testsuite/gcc.target/powerpc/pure-builtin-redundant-load.c new file mode 100644 index 00000000000..16ab6abfc3b --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/pure-builtin-redundant-load.c @@ -0,0 +1,47 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target powerpc_vsx_ok } */ +/* { dg-options "-O2 -fdump-tree-fre-all -mvsx" } */ + +/* Verify we remove a redundant load that occurs both before and after +we call a vector load builtin. +This testcase is introduced as we updated a number of our vector load +built-ins with the attribute of PURE instead of MEM, to indicate that +those builtins only read from memory, versus reading from and writing +to the same. +This means we can identify the redundant load instructions in an earlier +pass, and optimize them away. */ + +#include <altivec.h> + +vector signed short load_data; + +vector signed short foo() +{ + vector signed short r11,r12,r13; + r11 = load_data; + r12 = vec_xl (0, &load_data[0]); + r13 = load_data; + return (r11 + r12 + r13); +} + +vector signed short biz() +{ + vector signed short r21,r22,r23; + r21 = load_data; + r22 = vec_lvehx (0, &load_data[0]); + r23 = load_data; + return (r21 + r22 + r23); +} + +vector signed short bar() +{ + vector signed short r31,r32,r33; + r31 = load_data; + r32 = vec_lvx (0, &load_data[0]); + r33 = load_data; + return (r31 + r32 + r33); +} + +/* { dg-final { scan-tree-dump-times "Removing dead stmt r13_. = load_data;" 1 "fre1" } } */ +/* { dg-final { scan-tree-dump-times "Removing dead stmt r23_. = load_data;" 1 "fre1" } } */ +/* { dg-final { scan-tree-dump-times "Removing dead stmt r33_. = load_data;" 1 "fre1" } } */ |