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R600: Don't set BypassSlowDiv for 64-bit division

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BypassSlowDiv is used by codegen prepare to insert a run-time
check to see if the operands to a 64-bit division are really 32-bit
values and if they are it will do 32-bit division instead.

This is not useful for R600, which has predicated control flow since
both the 32-bit and 64-bit paths will be executed in most cases.  It
also increases code size which can lead to more instruction cache
misses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218252 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2014-09-22 15:35:32 +00:00
parent e2badaf84f
commit a05b67769e
1 changed files with 0 additions and 3 deletions
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3
lib/Target/R600/AMDGPUISelLowering.cpp
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@ -392,9 +392,6 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) :
setIntDivIsCheap(false);
setPow2SDivIsCheap(false);
// TODO: Investigate this when 64-bit divides are implemented.
addBypassSlowDiv(64, 32);
// FIXME: Need to really handle these.
MaxStoresPerMemcpy = 4096;
MaxStoresPerMemmove = 4096;