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37bc2f3216
Handle "X + ~X" -> "-1" in the function Value *Reassociate::OptimizeAdd(Instruction *I, SmallVectorImpl<ValueEntry> &Ops); This patch implements: TODO: We could handle "X + ~X" -> "-1" if we wanted, since "-X = ~X+1". Patch by Rahul Jain! Differential Revision: http://reviews.llvm.org/D3835 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209973 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.1 KiB
LLVM
47 lines
1.1 KiB
LLVM
; RUN: opt < %s -reassociate -die -S | FileCheck %s
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define i32 @test1(i32 %a, i32 %b) {
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%tmp.2 = and i32 %b, %a
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%tmp.4 = xor i32 %a, -1
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; (A&B)&~A == 0
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%tmp.5 = and i32 %tmp.2, %tmp.4
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ret i32 %tmp.5
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; CHECK-LABEL: @test1(
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; CHECK: ret i32 0
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}
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define i32 @test2(i32 %a, i32 %b) {
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%tmp.1 = and i32 %a, 1234
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%tmp.2 = and i32 %b, %tmp.1
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%tmp.4 = xor i32 %a, -1
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; A&~A == 0
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%tmp.5 = and i32 %tmp.2, %tmp.4
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ret i32 %tmp.5
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; CHECK-LABEL: @test2(
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; CHECK: ret i32 0
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}
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define i32 @test3(i32 %b, i32 %a) {
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%tmp.1 = add i32 %a, 1234
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%tmp.2 = add i32 %b, %tmp.1
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%tmp.4 = sub i32 0, %a
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; (b+(a+1234))+-a -> b+1234
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%tmp.5 = add i32 %tmp.2, %tmp.4
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ret i32 %tmp.5
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; CHECK-LABEL: @test3(
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; CHECK: %tmp.5 = add i32 %b, 1234
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; CHECK: ret i32 %tmp.5
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}
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define i32 @test4(i32 %b, i32 %a) {
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%tmp.1 = add i32 %a, 1234
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%tmp.2 = add i32 %b, %tmp.1
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%tmp.4 = xor i32 %a, -1
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; (b+(a+1234))+~a -> b+1233
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%tmp.5 = add i32 %tmp.2, %tmp.4
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ret i32 %tmp.5
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; CHECK-LABEL: @test4(
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; CHECK: %tmp.5 = add i32 %b, 1233
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; CHECK: ret i32 %tmp.5
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}
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