128 lines
3.8 KiB
LLVM
128 lines
3.8 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -basic-aa -dse -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa -passes=dse -S | FileCheck %s
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declare void @use(i64*)
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define void @test1() {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[A:%.*]] = alloca i64, align 8
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; CHECK-NEXT: call void @use(i64* [[A]])
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; CHECK-NEXT: [[PTR1:%.*]] = bitcast i64* [[A]] to i8*
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; CHECK-NEXT: [[PTR2:%.*]] = getelementptr i8, i8* [[PTR1]], i32 1
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; CHECK-NEXT: store i8 10, i8* [[PTR1]], align 1
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; CHECK-NEXT: store i8 20, i8* [[PTR2]], align 1
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; CHECK-NEXT: [[LV:%.*]] = load i64, i64* [[A]], align 4
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; CHECK-NEXT: store i8 0, i8* [[PTR1]], align 1
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; CHECK-NEXT: call void @use(i64* [[A]])
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; CHECK-NEXT: ret void
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;
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%a = alloca i64
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call void @use(i64* %a)
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%ptr1 = bitcast i64* %a to i8*
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%ptr2 = getelementptr i8, i8* %ptr1, i32 1
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store i8 10, i8* %ptr1
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store i8 20, i8* %ptr2
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%lv = load i64, i64* %a
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store i8 0, i8* %ptr1
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call void @use(i64* %a)
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ret void
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}
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define void @test2() {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[A:%.*]] = alloca i64, align 8
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; CHECK-NEXT: call void @use(i64* [[A]])
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; CHECK-NEXT: [[PTR1:%.*]] = bitcast i64* [[A]] to i8*
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; CHECK-NEXT: [[PTR2:%.*]] = getelementptr i8, i8* [[PTR1]], i32 1
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; CHECK-NEXT: store i8 10, i8* [[PTR1]], align 1
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; CHECK-NEXT: store i8 20, i8* [[PTR2]], align 1
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; CHECK-NEXT: br i1 undef, label [[BB1:%.*]], label [[END:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: [[LV:%.*]] = load i64, i64* [[A]], align 4
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: store i8 0, i8* [[PTR1]], align 1
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; CHECK-NEXT: call void @use(i64* [[A]])
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; CHECK-NEXT: ret void
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;
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%a = alloca i64
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call void @use(i64* %a)
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%ptr1 = bitcast i64* %a to i8*
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%ptr2 = getelementptr i8, i8* %ptr1, i32 1
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store i8 10, i8* %ptr1
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store i8 20, i8* %ptr2
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br i1 undef, label %bb1, label %end
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bb1:
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%lv = load i64, i64* %a
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br label %end
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end:
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store i8 0, i8* %ptr1
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call void @use(i64* %a)
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ret void
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}
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; The store to %a0 is dead, because only %a1 is read later.
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define void @test3(i1 %c) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[A:%.*]] = alloca [2 x i8], align 1
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; CHECK-NEXT: [[A1:%.*]] = getelementptr [2 x i8], [2 x i8]* [[A]], i32 0, i32 1
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: store [2 x i8] zeroinitializer, [2 x i8]* [[A]], align 1
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; CHECK-NEXT: br label [[ELSE]]
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; CHECK: else:
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; CHECK-NEXT: [[TMP1:%.*]] = load i8, i8* [[A1]], align 1
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; CHECK-NEXT: ret void
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;
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%a = alloca [2 x i8]
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%a0 = getelementptr [2 x i8], [2 x i8]* %a, i32 0, i32 0
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%a1 = getelementptr [2 x i8], [2 x i8]* %a, i32 0, i32 1
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store i8 1, i8* %a0
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br i1 %c, label %if, label %else
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if:
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store [2 x i8] zeroinitializer, [2 x i8]* %a
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br label %else
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else:
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load i8, i8* %a1
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ret void
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}
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; Variation on the previous test case, where only the store to %a0 is dead,
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; but not the one to %a1. This tests for a potential caching bug.
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define void @test4(i1 %c) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[A:%.*]] = alloca [2 x i8], align 1
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; CHECK-NEXT: [[A1:%.*]] = getelementptr [2 x i8], [2 x i8]* [[A]], i32 0, i32 1
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; CHECK-NEXT: store i8 1, i8* [[A1]], align 1
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: store [2 x i8] zeroinitializer, [2 x i8]* [[A]], align 1
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; CHECK-NEXT: br label [[ELSE]]
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; CHECK: else:
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; CHECK-NEXT: [[TMP1:%.*]] = load i8, i8* [[A1]], align 1
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; CHECK-NEXT: ret void
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;
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%a = alloca [2 x i8]
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%a0 = getelementptr [2 x i8], [2 x i8]* %a, i32 0, i32 0
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%a1 = getelementptr [2 x i8], [2 x i8]* %a, i32 0, i32 1
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store i8 1, i8* %a1
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store i8 1, i8* %a0
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br i1 %c, label %if, label %else
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if:
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store [2 x i8] zeroinitializer, [2 x i8]* %a
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br label %else
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else:
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load i8, i8* %a1
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ret void
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}
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