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fix minsize detection: minsize attribute implies optimizing for size

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llvm-svn: 244631
This commit is contained in:
Sanjay Patel 2015-08-11 17:04:31 +00:00
parent ce2deb2290
commit f473c5974a
2 changed files with 7 additions and 17 deletions
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7
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -3971,10 +3971,9 @@ static SDValue ExpandPowI(SDLoc DL, SDValue LHS, SDValue RHS,
return DAG.getConstantFP(1.0, DL, LHS.getValueType());
const Function *F = DAG.getMachineFunction().getFunction();
// FIXME: Use Function::optForSize().
if (!F->hasFnAttribute(Attribute::OptimizeForSize) ||
// If optimizing for size, don't insert too many multiplies. This
// inserts up to 5 multiplies.
if (!F->optForSize() ||
// If optimizing for size, don't insert too many multiplies.
// This inserts up to 5 multiplies.
countPopulation(Val) + Log2_32(Val) < 7) {
// We use the simple binary decomposition method to generate the multiply
// sequence. There are more optimal ways to do this (for example,

17
test/CodeGen/X86/powi.ll
View File

@ -17,7 +17,7 @@ define double @pow_wrapper(double %a) nounwind readonly ssp noredzone {
ret double %ret
}
define double @pow_wrapper_optsize(double %a) optsize {
define double @pow_wrapper_optsize(double %a) optsize {
; CHECK-LABEL: pow_wrapper_optsize:
; CHECK: # BB#0:
; CHECK-NEXT: movl $15, %edi
@ -26,20 +26,11 @@ define double @pow_wrapper_optsize(double %a) optsize {
ret double %ret
}
; FIXME: Should not expand with minsize
define double @pow_wrapper_minsize(double %a) minsize {
define double @pow_wrapper_minsize(double %a) minsize {
; CHECK-LABEL: pow_wrapper_minsize:
; CHECK: # BB#0:
; CHECK-NEXT: movapd %xmm0, %xmm1
; CHECK-NEXT: mulsd %xmm1, %xmm1
; CHECK-NEXT: mulsd %xmm1, %xmm0
; CHECK-NEXT: mulsd %xmm1, %xmm1
; CHECK-NEXT: mulsd %xmm1, %xmm0
; CHECK-NEXT: mulsd %xmm1, %xmm1
; CHECK-NEXT: mulsd %xmm0, %xmm1
; CHECK-NEXT: movapd %xmm1, %xmm0
; CHECK-NEXT: retq
; CHECK-NEXT: movl $15, %edi
; CHECK-NEXT: jmp
%ret = tail call double @llvm.powi.f64(double %a, i32 15) nounwind ; <double> [#uses=1]
ret double %ret
}