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| author | Hongyu Wang <hongyu.wang@intel.com> | 2019-12-17 01:50:35 +0000 |
|---|---|---|
| committer | Hongtao Liu <liuhongt@gcc.gnu.org> | 2019-12-17 01:50:35 +0000 |
| commit | da86c5af207cb04869108aa79b2d0117752e291a (patch) | |
| tree | 3f900a6d3da0a393f0158d04091da841c165eaa6 /gcc/config/i386/x86-tune.def | |
| parent | 62dd2904f05ee752bbeff43a196b90ecd7b94616 (diff) | |
| download | gcc-da86c5af207cb04869108aa79b2d0117752e291a.zip gcc-da86c5af207cb04869108aa79b2d0117752e291a.tar.gz gcc-da86c5af207cb04869108aa79b2d0117752e291a.tar.bz2 | |
Add abs pattern to handle {si,di} mode abs to avoid pmax/cmove conversion.
2019-12-17 Hongyu Wang <hongyu.wang@intel.com>
gcc/
PR target/92651
* config/i386/i386.h (TARGET_EXPAND_ABS): New macro.
* config/i386/x86-tune.def (X86_TUNE_EXPAND_ABS): New.
* config/i386/i386.md (abs<SWI48x>2): New define_expand.
gcc/testsuite
* gcc.target/i386/pr92651.c: New testcase.
From-SVN: r279452
Diffstat (limited to 'gcc/config/i386/x86-tune.def')
| -rw-r--r-- | gcc/config/i386/x86-tune.def | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def index 328535d..58a81e5 100644 --- a/gcc/config/i386/x86-tune.def +++ b/gcc/config/i386/x86-tune.def @@ -317,6 +317,13 @@ DEF_TUNE (X86_TUNE_ONE_IF_CONV_INSN, "one_if_conv_insn", DEF_TUNE (X86_TUNE_USE_XCHG_FOR_ATOMIC_STORE, "use_xchg_for_atomic_store", m_CORE_ALL | m_BDVER | m_ZNVER | m_GENERIC) +/* X86_TUNE_EXPAND_ABS: This enables a new abs pattern by + generating instructions for abs (x) = (((signed) x >> (W-1) ^ x) - + (signed) x >> (W-1)) instead of cmove or SSE max/abs instructions. */ +DEF_TUNE (X86_TUNE_EXPAND_ABS, "expand_abs", + m_CORE_ALL | m_SILVERMONT | m_KNL | m_KNM | m_GOLDMONT + | m_GOLDMONT_PLUS | m_TREMONT ) + /*****************************************************************************/ /* 387 instruction selection tuning */ /*****************************************************************************/ |