| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -basic-aa -dse -S | FileCheck %s |
| ; RUN: opt < %s -aa-pipeline=basic-aa -passes=dse -S | FileCheck %s |
| 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" |
| |
| declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind |
| declare void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* nocapture, i8, i64, i32) nounwind |
| declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind |
| declare void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind |
| declare void @llvm.init.trampoline(i8*, i8*, i8*) |
| |
| ; **** Noop load->store tests ************************************************** |
| |
| ; We CAN optimize volatile loads. |
| define void @test_load_volatile(i32* %Q) { |
| ; CHECK-LABEL: @test_load_volatile( |
| ; CHECK-NEXT: [[A:%.*]] = load volatile i32, i32* [[Q:%.*]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| %a = load volatile i32, i32* %Q |
| store i32 %a, i32* %Q |
| ret void |
| } |
| |
| ; We can NOT optimize volatile stores. |
| define void @test_store_volatile(i32* %Q) { |
| ; CHECK-LABEL: @test_store_volatile( |
| ; CHECK-NEXT: [[A:%.*]] = load i32, i32* [[Q:%.*]], align 4 |
| ; CHECK-NEXT: store volatile i32 [[A]], i32* [[Q]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| %a = load i32, i32* %Q |
| store volatile i32 %a, i32* %Q |
| ret void |
| } |
| |
| ; PR2599 - load -> store to same address. |
| define void @test12({ i32, i32 }* %x) nounwind { |
| ; CHECK-LABEL: @test12( |
| ; CHECK-NEXT: [[TMP7:%.*]] = getelementptr { i32, i32 }, { i32, i32 }* [[X:%.*]], i32 0, i32 1 |
| ; CHECK-NEXT: [[TMP8:%.*]] = load i32, i32* [[TMP7]], align 4 |
| ; CHECK-NEXT: [[TMP17:%.*]] = sub i32 0, [[TMP8]] |
| ; CHECK-NEXT: store i32 [[TMP17]], i32* [[TMP7]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| %tmp4 = getelementptr { i32, i32 }, { i32, i32 }* %x, i32 0, i32 0 |
| %tmp5 = load i32, i32* %tmp4, align 4 |
| %tmp7 = getelementptr { i32, i32 }, { i32, i32 }* %x, i32 0, i32 1 |
| %tmp8 = load i32, i32* %tmp7, align 4 |
| %tmp17 = sub i32 0, %tmp8 |
| store i32 %tmp5, i32* %tmp4, align 4 |
| store i32 %tmp17, i32* %tmp7, align 4 |
| ret void |
| } |
| |
| ; Remove redundant store if loaded value is in another block. |
| define i32 @test26(i1 %c, i32* %p) { |
| ; CHECK-LABEL: @test26( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[BB3:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: br label [[BB3]] |
| ; CHECK: bb3: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| %v = load i32, i32* %p, align 4 |
| br i1 %c, label %bb1, label %bb2 |
| bb1: |
| br label %bb3 |
| bb2: |
| store i32 %v, i32* %p, align 4 |
| br label %bb3 |
| bb3: |
| ret i32 0 |
| } |
| |
| ; Remove redundant store if loaded value is in another block. |
| define i32 @test27(i1 %c, i32* %p) { |
| ; CHECK-LABEL: @test27( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[BB3:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: br label [[BB3]] |
| ; CHECK: bb3: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| %v = load i32, i32* %p, align 4 |
| br i1 %c, label %bb1, label %bb2 |
| bb1: |
| br label %bb3 |
| bb2: |
| br label %bb3 |
| bb3: |
| store i32 %v, i32* %p, align 4 |
| ret i32 0 |
| } |
| |
| ; Remove redundant store if loaded value is in another block inside a loop. |
| define i32 @test31(i1 %c, i32* %p, i32 %i) { |
| ; CHECK-LABEL: @test31( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[BB1:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1]], label [[BB2:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| %v = load i32, i32* %p, align 4 |
| br label %bb1 |
| bb1: |
| store i32 %v, i32* %p, align 4 |
| br i1 %c, label %bb1, label %bb2 |
| bb2: |
| ret i32 0 |
| } |
| |
| ; Don't remove "redundant" store if %p is possibly stored to. |
| define i32 @test46(i1 %c, i32* %p, i32* %p2, i32 %i) { |
| ; CHECK-LABEL: @test46( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4 |
| ; CHECK-NEXT: br label [[BB1:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: store i32 [[V]], i32* [[P]], align 4 |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1]], label [[BB2:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: store i32 0, i32* [[P2:%.*]], align 4 |
| ; CHECK-NEXT: br i1 [[C]], label [[BB3:%.*]], label [[BB1]] |
| ; CHECK: bb3: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| %v = load i32, i32* %p, align 4 |
| br label %bb1 |
| bb1: |
| store i32 %v, i32* %p, align 4 |
| br i1 %c, label %bb1, label %bb2 |
| bb2: |
| store i32 0, i32* %p2, align 4 |
| br i1 %c, label %bb3, label %bb1 |
| bb3: |
| ret i32 0 |
| } |
| |
| declare void @unknown_func() |
| |
| ; Remove redundant store, which is in the lame loop as the load. |
| define i32 @test33(i1 %c, i32* %p, i32 %i) { |
| ; CHECK-LABEL: @test33( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[BB1:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[BB2:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: call void @unknown_func() |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1]], label [[BB3:%.*]] |
| ; CHECK: bb3: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %bb1 |
| bb1: |
| %v = load i32, i32* %p, align 4 |
| br label %bb2 |
| bb2: |
| store i32 %v, i32* %p, align 4 |
| ; Might read and overwrite value at %p, but doesn't matter. |
| call void @unknown_func() |
| br i1 %c, label %bb1, label %bb3 |
| bb3: |
| ret i32 0 |
| } |
| |
| declare void @unkown_write(i32*) |
| |
| ; We can't remove the "noop" store around an unkown write. |
| define void @test43(i32* %Q) { |
| ; CHECK-LABEL: @test43( |
| ; CHECK-NEXT: [[A:%.*]] = load i32, i32* [[Q:%.*]], align 4 |
| ; CHECK-NEXT: call void @unkown_write(i32* [[Q]]) |
| ; CHECK-NEXT: store i32 [[A]], i32* [[Q]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| %a = load i32, i32* %Q |
| call void @unkown_write(i32* %Q) |
| store i32 %a, i32* %Q |
| ret void |
| } |
| |
| ; We CAN remove it when the unkown write comes AFTER. |
| define void @test44(i32* %Q) { |
| ; CHECK-LABEL: @test44( |
| ; CHECK-NEXT: call void @unkown_write(i32* [[Q:%.*]]) |
| ; CHECK-NEXT: ret void |
| ; |
| %a = load i32, i32* %Q |
| store i32 %a, i32* %Q |
| call void @unkown_write(i32* %Q) |
| ret void |
| } |
| |
| define void @test45(i32* %Q) { |
| ; CHECK-LABEL: @test45( |
| ; CHECK-NEXT: ret void |
| ; |
| %a = load i32, i32* %Q |
| store i32 10, i32* %Q |
| store i32 %a, i32* %Q |
| ret void |
| } |
| |
| define i32 @test48(i1 %c, i32* %p) { |
| ; CHECK-LABEL: @test48( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4 |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB0:%.*]], label [[BB0_0:%.*]] |
| ; CHECK: bb0: |
| ; CHECK-NEXT: store i32 0, i32* [[P]], align 4 |
| ; CHECK-NEXT: br i1 [[C]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb0.0: |
| ; CHECK-NEXT: br label [[BB1]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: store i32 [[V]], i32* [[P]], align 4 |
| ; CHECK-NEXT: br i1 [[C]], label [[BB2]], label [[BB0]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| %v = load i32, i32* %p, align 4 |
| br i1 %c, label %bb0, label %bb0.0 |
| |
| bb0: |
| store i32 0, i32* %p |
| br i1 %c, label %bb1, label %bb2 |
| |
| bb0.0: |
| br label %bb1 |
| |
| bb1: |
| store i32 %v, i32* %p, align 4 |
| br i1 %c, label %bb2, label %bb0 |
| bb2: |
| ret i32 0 |
| } |
| |
| define i32 @test47(i1 %c, i32* %p, i32 %i) { |
| ; CHECK-LABEL: @test47( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[BB1:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1]], label [[BB2:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: br i1 [[C]], label [[BB3:%.*]], label [[BB1]] |
| ; CHECK: bb3: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| %v = load i32, i32* %p, align 4 |
| br label %bb1 |
| bb1: |
| store i32 %v, i32* %p, align 4 |
| br i1 %c, label %bb1, label %bb2 |
| bb2: |
| store i32 %v, i32* %p, align 4 |
| br i1 %c, label %bb3, label %bb1 |
| bb3: |
| ret i32 0 |
| } |
| |
| ; Test case from PR47887. |
| define void @test_noalias_store_between_load_and_store(i32* noalias %x, i32* noalias %y) { |
| ; CHECK-LABEL: @test_noalias_store_between_load_and_store( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i32 0, i32* [[Y:%.*]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %lv = load i32, i32* %x, align 4 |
| store i32 0, i32* %y, align 4 |
| store i32 %lv, i32* %x, align 4 |
| ret void |
| } |
| |
| ; Test case from PR47887. Currently we eliminate the dead `store i32 %inc, i32* %x`, |
| ; but not the no-op `store i32 %lv, i32* %x`. That is because no-op stores are |
| ; eliminated before dead stores for the same def. |
| define void @test_noalias_store_between_load_and_store_elimin_order(i32* noalias %x, i32* noalias %y) { |
| ; CHECK-LABEL: @test_noalias_store_between_load_and_store_elimin_order( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i32 0, i32* [[Y:%.*]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %lv = load i32, i32* %x, align 4 |
| %inc = add nsw i32 %lv, 1 |
| store i32 %inc, i32* %x, align 4 |
| store i32 0, i32* %y, align 4 |
| store i32 %lv, i32* %x, align 4 |
| ret void |
| } |