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| author | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2015-02-11 14:22:18 +0000 |
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| committer | Andrea Di Biagio <Andrea_DiBiagio@sn.scee.net> | 2015-02-11 14:22:18 +0000 |
| commit | 2a0e435db10496db2d63126d871575a0e94cf2c3 (patch) | |
| tree | e4f3aaa35a310f319000114a966eabc31fffa1cc /llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp | |
| parent | cb527a7fcdaf53ba4e9ef4e698debf4ed2c3b1f7 (diff) | |
| download | llvm-2a0e435db10496db2d63126d871575a0e94cf2c3.zip llvm-2a0e435db10496db2d63126d871575a0e94cf2c3.tar.gz llvm-2a0e435db10496db2d63126d871575a0e94cf2c3.tar.bz2 | |
[TTI] Improved cost heuristic for cttz/ctlz calls.
This patch is a follow-up of r228826 (see code-review: D7506).
Now that SimplifyCFG uses TargetTransformInfo for cost analysis, we
have to fix the cost heuristic for intrinsic calls to cttz/ctlz.
This patch defines method 'getIntrinsicCost' in BasicTTIImpl: now, BasicTTIImpl
queries TLI to check if a call to cttz/ctlz is cheap for the target.
Added test cases in Transforms/SimplifyCFG/X86 to verify that on x86,
SimplifyCFG only speculates a call to cttz/ctlz if it is cheap.
Differential Revision: http://reviews.llvm.org/D7554
llvm-svn: 228829
Diffstat (limited to 'llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp')
0 files changed, 0 insertions, 0 deletions