forked from OSchip/llvm-project
172 lines
4.7 KiB
LLVM
172 lines
4.7 KiB
LLVM
; RUN: opt < %s -basic-aa -dse -enable-dse-memoryssa -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa -passes=dse -enable-dse-memoryssa -S | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind
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declare void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* nocapture, i8, i64, i32) nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
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declare void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind
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declare void @llvm.init.trampoline(i8*, i8*, i8*)
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; **** Noop load->store tests **************************************************
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; We CAN optimize volatile loads.
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define void @test_load_volatile(i32* %Q) {
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; CHECK-LABEL: @test_load_volatile(
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; CHECK-NEXT: [[A:%.*]] = load volatile i32, i32* [[Q:%.*]]
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; CHECK-NEXT: store i32 [[A]], i32* [[Q]]
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; CHECK-NEXT: ret void
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;
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%a = load volatile i32, i32* %Q
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store i32 %a, i32* %Q
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ret void
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}
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; We can NOT optimize volatile stores.
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define void @test_store_volatile(i32* %Q) {
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; CHECK-LABEL: @test_store_volatile(
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; CHECK-NEXT: [[A:%.*]] = load i32, i32* [[Q:%.*]]
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; CHECK-NEXT: store volatile i32 [[A]]
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; CHECK-NEXT: ret void
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;
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%a = load i32, i32* %Q
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store volatile i32 %a, i32* %Q
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ret void
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}
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; PR2599 - load -> store to same address.
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define void @test12({ i32, i32 }* %x) nounwind {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: [[TMP7:%.*]] = getelementptr { i32, i32 }, { i32, i32 }* [[X:%.*]], i32 0, i32 1
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; CHECK-NEXT: [[TMP8:%.*]] = load i32, i32* [[TMP7]], align 4
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; CHECK-NEXT: [[TMP17:%.*]] = sub i32 0, [[TMP8]]
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; CHECK-NEXT: store i32 [[TMP17]], i32* [[TMP7]], align 4
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; CHECK-NEXT: ret void
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;
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%tmp4 = getelementptr { i32, i32 }, { i32, i32 }* %x, i32 0, i32 0
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%tmp5 = load i32, i32* %tmp4, align 4
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%tmp7 = getelementptr { i32, i32 }, { i32, i32 }* %x, i32 0, i32 1
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%tmp8 = load i32, i32* %tmp7, align 4
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%tmp17 = sub i32 0, %tmp8
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store i32 %tmp5, i32* %tmp4, align 4
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store i32 %tmp17, i32* %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, i32* %p) {
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; CHECK-LABEL: @test26(
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; CHECK-NEXT: entry:
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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, i32* %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, i32* %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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; Remove redundant store if loaded value is in another block.
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define i32 @test27(i1 %c, i32* %p) {
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; CHECK-LABEL: @test27(
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; CHECK-NEXT: entry:
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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, i32* %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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br label %bb3
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bb3:
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store i32 %v, i32* %p, align 4
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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 lame loop as the load.
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define i32 @test33(i1 %c, i32* %p, i32 %i) {
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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: 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 undef, 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, i32* %p, align 4
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br label %bb2
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bb2:
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store i32 %v, i32* %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 undef, label %bb1, label %bb3
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bb3:
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ret i32 0
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}
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declare void @unkown_write(i32*)
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; We can't remove the "noop" store around an unkown write.
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define void @test43(i32* %Q) {
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; CHECK-LABEL: @test43(
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; CHECK-NEXT: load
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; CHECK-NEXT: call
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; CHECK-NEXT: store
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; CHECK-NEXT: ret void
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;
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%a = load i32, i32* %Q
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call void @unkown_write(i32* %Q)
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store i32 %a, i32* %Q
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ret void
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}
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; We CAN remove it when the unkown write comes AFTER.
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define void @test44(i32* %Q) {
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; CHECK-LABEL: @test44(
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; CHECK-NEXT: call
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; CHECK-NEXT: ret void
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%a = load i32, i32* %Q
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store i32 %a, i32* %Q
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call void @unkown_write(i32* %Q)
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ret void
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}
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define void @test45(i32* %Q) {
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; CHECK-LABEL: @test45(
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; CHECK-NEXT: [[A:%.*]] = load
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; CHECK-NEXT: store i32 [[A]]
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; CHECK-NEXT: ret void
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%a = load i32, i32* %Q
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store i32 10, i32* %Q
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store i32 %a, i32* %Q
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ret void
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}
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