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Division by pow-of-2 is not cheap on SPU, do it with

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shifts.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120022 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kalle Raiskila 2010-11-23 13:27:59 +00:00
parent beb6898df8
commit 0cc5b1f60e
2 changed files with 22 additions and 2 deletions
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2
lib/Target/CellSPU/SPUISelLowering.cpp
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@ -97,8 +97,6 @@ namespace {
SPUTargetLowering::SPUTargetLowering(SPUTargetMachine &TM)
: TargetLowering(TM, new TargetLoweringObjectFileELF()),
SPUTM(TM) {
// Fold away setcc operations if possible.
setPow2DivIsCheap();
// Use _setjmp/_longjmp instead of setjmp/longjmp.
setUseUnderscoreSetJmp(true);

22
test/CodeGen/CellSPU/div_ops.ll Normal file
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@ -0,0 +1,22 @@
; RUN: llc --march=cellspu %s -o - | FileCheck %s
; signed division rounds towards zero, rotma don't.
define i32 @sdivide (i32 %val )
{
; CHECK: rotmai
; CHECK: rotmi
; CHECK: a
; CHECK: rotmai
; CHECK: bi $lr
%rv = sdiv i32 %val, 4
ret i32 %rv
}
define i32 @udivide (i32 %val )
{
; CHECK: rotmi
; CHECK: bi $lr
%rv = udiv i32 %val, 4
ret i32 %rv
}