| ; RUN: opt < %s -simplifycfg -S | FileCheck %s |
| ; PR2967 |
| |
| target datalayout = |
| "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32" |
| target triple = "i386-pc-linux-gnu" |
| |
| define void @test1(i32 %x) nounwind { |
| entry: |
| %0 = icmp eq i32 %x, 0 ; <i1> [#uses=1] |
| br i1 %0, label %bb, label %return |
| |
| bb: ; preds = %entry |
| %1 = load volatile i32, i32* null |
| unreachable |
| |
| br label %return |
| return: ; preds = %entry |
| ret void |
| ; CHECK-LABEL: @test1( |
| ; CHECK: load volatile |
| } |
| |
| define void @test1_no_null_opt(i32 %x) nounwind #0 { |
| entry: |
| %0 = icmp eq i32 %x, 0 ; <i1> [#uses=1] |
| br i1 %0, label %bb, label %return |
| |
| bb: ; preds = %entry |
| %1 = load volatile i32, i32* null |
| unreachable |
| |
| br label %return |
| return: ; preds = %entry |
| ret void |
| ; CHECK-LABEL: @test1_no_null_opt( |
| ; CHECK: load volatile |
| ; CHECK: unreachable |
| } |
| |
| ; rdar://7958343 |
| define void @test2() nounwind { |
| entry: |
| store i32 4,i32* null |
| ret void |
| |
| ; CHECK-LABEL: @test2( |
| ; CHECK: call void @llvm.trap |
| ; CHECK: unreachable |
| } |
| |
| define void @test2_no_null_opt() nounwind #0 { |
| entry: |
| store i32 4,i32* null |
| ret void |
| ; CHECK-LABEL: @test2_no_null_opt( |
| ; CHECK: store i32 4, i32* null |
| ; CHECK-NOT: call void @llvm.trap |
| ; CHECK: ret |
| } |
| |
| ; PR7369 |
| define void @test3() nounwind { |
| entry: |
| store volatile i32 4, i32* null |
| ret void |
| |
| ; CHECK-LABEL: @test3( |
| ; CHECK: store volatile i32 4, i32* null |
| ; CHECK: ret |
| } |
| |
| define void @test3_no_null_opt() nounwind #0 { |
| entry: |
| store volatile i32 4, i32* null |
| ret void |
| |
| ; CHECK-LABEL: @test3_no_null_opt( |
| ; CHECK: store volatile i32 4, i32* null |
| ; CHECK: ret |
| } |
| |
| ; Check store before unreachable. |
| define void @test4(i1 %C, i32* %P) { |
| ; CHECK-LABEL: @test4( |
| ; CHECK: entry: |
| ; CHECK-NEXT: br i1 %C |
| entry: |
| br i1 %C, label %T, label %F |
| T: |
| store volatile i32 0, i32* %P |
| unreachable |
| F: |
| ret void |
| } |
| |
| ; Check cmpxchg before unreachable. |
| define void @test5(i1 %C, i32* %P) { |
| ; CHECK-LABEL: @test5( |
| ; CHECK: entry: |
| ; CHECK-NEXT: br i1 %C |
| entry: |
| br i1 %C, label %T, label %F |
| T: |
| cmpxchg volatile i32* %P, i32 0, i32 1 seq_cst seq_cst |
| unreachable |
| F: |
| ret void |
| } |
| |
| ; Check atomicrmw before unreachable. |
| define void @test6(i1 %C, i32* %P) { |
| ; CHECK-LABEL: @test6( |
| ; CHECK: entry: |
| ; CHECK-NEXT: br i1 %C |
| entry: |
| br i1 %C, label %T, label %F |
| T: |
| atomicrmw volatile xchg i32* %P, i32 0 seq_cst |
| unreachable |
| F: |
| ret void |
| } |
| |
| attributes #0 = { "null-pointer-is-valid"="true" } |