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3757169d38
As part of r251146 InstCombine was extended to call computeKnownBits on every value in the function to determine whether it happens to be constant. This increases typical compiletime by 1-3% (5% in irgen+opt time) in my measurements. On the other hand this case did not trigger once in the whole llvm-testsuite. This patch introduces the notion of ExpensiveCombines which are only enabled for OptLevel > 2. I removed the check in InstructionSimplify as that is called from various places where the OptLevel is not known but given the rarity of the situation I think a check in InstCombine is enough. Differential Revision: http://reviews.llvm.org/D16835 llvm-svn: 263047
35 lines
777 B
LLVM
35 lines
777 B
LLVM
; RUN: opt -S -instsimplify -instcombine < %s | FileCheck %s
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define i1 @test0(i8* %ptr) {
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; CHECK-LABEL: @test0(
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entry:
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%val = load i8, i8* %ptr, !range !{i8 -50, i8 0}
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%and = and i8 %val, 128
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%is.eq = icmp eq i8 %and, 128
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ret i1 %is.eq
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; CHECK: ret i1 true
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}
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define i1 @test1(i8* %ptr) {
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; CHECK-LABEL: @test1(
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entry:
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%val = load i8, i8* %ptr, !range !{i8 64, i8 128}
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%and = and i8 %val, 64
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%is.eq = icmp eq i8 %and, 64
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ret i1 %is.eq
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; CHECK: ret i1 true
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}
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define i1 @test2(i8* %ptr) {
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; CHECK-LABEL: @test2(
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entry:
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; CHECK: %val = load i8
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; CHECK: %and = and i8 %val
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; CHECK: %is.eq = icmp ne i8 %and, 0
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; CHECK: ret i1 %is.eq
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%val = load i8, i8* %ptr, !range !{i8 64, i8 129}
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%and = and i8 %val, 64
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%is.eq = icmp eq i8 %and, 64
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ret i1 %is.eq
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}
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