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| 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 | cf9a9a148e9d80d89ad24be08b45c1bd7f71463a (patch) | |
| tree | b106f9fa1da07a661cbdc433f67cf09a93c24a61 /llvm/lib | |
| parent | 66ee0816dae60e77c4a292586525cee1d96f6ced (diff) | |
| download | bcm5719-llvm-cf9a9a148e9d80d89ad24be08b45c1bd7f71463a.tar.gz bcm5719-llvm-cf9a9a148e9d80d89ad24be08b45c1bd7f71463a.zip | |
R600: Report that integer division is expensive.
Divides by weird constants now emit much better code.
llvm-svn: 210995
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/R600/AMDGPUISelLowering.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/R600/AMDGPUISelLowering.cpp b/llvm/lib/Target/R600/AMDGPUISelLowering.cpp index 7867de23fd2..d4fd3164fd8 100644 --- a/llvm/lib/Target/R600/AMDGPUISelLowering.cpp +++ b/llvm/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; |
