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| author | Li Wei <liwei@loongson.cn> | 2023-11-17 10:38:02 +0800 |
|---|---|---|
| committer | Lulu Cheng <chenglulu@loongson.cn> | 2023-11-17 16:39:08 +0800 |
| commit | 5c8cb429762062f851a56801f021d81f4ecfe3d9 (patch) | |
| tree | a26e9423b2188ee1b097c24c1548a3c07082a096 /gcc/fortran | |
| parent | 1bcb7fe60544bba8b88028f9ffa062336d399664 (diff) | |
| download | gcc-5c8cb429762062f851a56801f021d81f4ecfe3d9.zip gcc-5c8cb429762062f851a56801f021d81f4ecfe3d9.tar.gz gcc-5c8cb429762062f851a56801f021d81f4ecfe3d9.tar.bz2 | |
LoongArch: Implement C[LT]Z_DEFINED_VALUE_AT_ZERO
The LoongArch has defined ctz and clz on the backend, but if we want GCC
do CTZ transformation optimization in forwprop2 pass, GCC need to know
the value of c[lt]z at zero, which may be beneficial for some test cases
(like spec2017 deepsjeng_r).
After implementing the macro, we test dynamic instruction count on
deepsjeng_r:
- before 1688423249186
- after 1660311215745 (1.66% reduction)
gcc/ChangeLog:
* config/loongarch/loongarch.h (CLZ_DEFINED_VALUE_AT_ZERO):
Implement.
(CTZ_DEFINED_VALUE_AT_ZERO): Same.
gcc/testsuite/ChangeLog:
* gcc.dg/pr90838.c: add clz/ctz test support on LoongArch.
Diffstat (limited to 'gcc/fortran')
0 files changed, 0 insertions, 0 deletions