derek.holloway
7502bf64a4
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79 lines
2.4 KiB
LLVM
79 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=newgvn -S | FileCheck %s
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;; Most of these are borrowed from transforms/DSE/simple.ll
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;; NewGVN should be able to eliminate any stores of the same value that are actually redundnat.
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;; tmp5 is store of the same value to the same location as the load.
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define void @test12(ptr %x) nounwind {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: [[TMP5:%.*]] = load i32, ptr [[X:%.*]], align 4
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; CHECK-NEXT: [[TMP7:%.*]] = getelementptr { i32, i32 }, ptr [[X]], i32 0, i32 1
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; CHECK-NEXT: [[TMP8:%.*]] = load i32, ptr [[TMP7]], align 4
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; CHECK-NEXT: [[TMP17:%.*]] = sub i32 0, [[TMP8]]
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; CHECK-NEXT: store i32 [[TMP17]], ptr [[TMP7]], align 4
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; CHECK-NEXT: ret void
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;
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%tmp4 = getelementptr { i32, i32 }, ptr %x, i32 0, i32 0
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%tmp5 = load i32, ptr %tmp4, align 4
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%tmp7 = getelementptr { i32, i32 }, ptr %x, i32 0, i32 1
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%tmp8 = load i32, ptr %tmp7, align 4
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%tmp17 = sub i32 0, %tmp8
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store i32 %tmp5, ptr %tmp4, align 4
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store i32 %tmp17, ptr %tmp7, align 4
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ret void
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}
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; Remove redundant store if loaded value is in another block.
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define i32 @test26(i1 %c, ptr %p) {
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; CHECK-LABEL: @test26(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[V:%.*]] = load i32, ptr [[P:%.*]], align 4
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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%v = load i32, ptr %p, align 4
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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store i32 %v, ptr %p, align 4
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br label %bb3
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bb3:
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ret i32 0
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}
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declare void @unknown_func()
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; Remove redundant store, which is in the same loop as the load.
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define i32 @test33(i1 %c, ptr %p, i32 %i, i1 %arg) {
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; CHECK-LABEL: @test33(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[BB1:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: [[V:%.*]] = load i32, ptr [[P:%.*]], align 4
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; CHECK-NEXT: br label [[BB2:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: call void @unknown_func()
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; CHECK-NEXT: br i1 [[ARG:%.*]], label [[BB1]], label [[BB3:%.*]]
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; CHECK: bb3:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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br label %bb1
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bb1:
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%v = load i32, ptr %p, align 4
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br label %bb2
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bb2:
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store i32 %v, ptr %p, align 4
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; Might read and overwrite value at %p, but doesn't matter.
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call void @unknown_func()
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br i1 %arg, label %bb1, label %bb3
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bb3:
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ret i32 0
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}
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