diff options
| author | Matt Arsenault <Matthew.Arsenault@amd.com> | 2014-06-15 19:48:16 +0000 |
|---|---|---|
| committer | Matt Arsenault <Matthew.Arsenault@amd.com> | 2014-06-15 19:48:16 +0000 |
| commit | 61bfbc4d966f1c1bcf9aabe36500d643d821fe43 (patch) | |
| tree | cb727c1d00c810d0b929f9f5822735d12271e3af /lib/Target/R600 | |
| parent | 36b9c7c87210e6d985c08e68b4ecdd59cf764cee (diff) | |
| download | llvm-61bfbc4d966f1c1bcf9aabe36500d643d821fe43.tar.gz llvm-61bfbc4d966f1c1bcf9aabe36500d643d821fe43.tar.bz2 llvm-61bfbc4d966f1c1bcf9aabe36500d643d821fe43.tar.xz | |
R600: Report that integer division is expensive.
Divides by weird constants now emit much better code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210995 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/R600')
| -rw-r--r-- | lib/Target/R600/AMDGPUISelLowering.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Target/R600/AMDGPUISelLowering.cpp b/lib/Target/R600/AMDGPUISelLowering.cpp index 7867de23fd..d4fd3164fd 100644 --- a/lib/Target/R600/AMDGPUISelLowering.cpp +++ b/lib/Target/R600/AMDGPUISelLowering.cpp @@ -327,6 +327,13 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) : setSchedulingPreference(Sched::RegPressure); setJumpIsExpensive(true); + // There are no integer divide instructions, and these expand to a pretty + // large sequence of instructions. + setIntDivIsCheap(false); + + // TODO: Investigate this when 64-bit divides are implemented. + addBypassSlowDiv(64, 32); + // FIXME: Need to really handle these. MaxStoresPerMemcpy = 4096; MaxStoresPerMemmove = 4096; |