| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| ; This testcase corresponds to PR362, which notices that this horrible code |
| ; is generated by the C++ front-end and LLVM optimizers, which has lots of |
| ; loads and other stuff that are unneeded. |
| ; |
| ; Instcombine should propagate the load through the select instructions to |
| ; allow elimination of the extra stuff by the mem2reg pass. |
| |
| define void @_Z5test1RiS_(i32* %x, i32* %y) { |
| ; CHECK-LABEL: @_Z5test1RiS_( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP_1_I:%.*]] = load i32, i32* [[Y:%.*]], align 4 |
| ; CHECK-NEXT: [[TMP_3_I:%.*]] = load i32, i32* [[X:%.*]], align 4 |
| ; CHECK-NEXT: [[TMP_4_I:%.*]] = icmp slt i32 [[TMP_1_I]], [[TMP_3_I]] |
| ; CHECK-NEXT: [[TMP_4:%.*]] = select i1 [[TMP_4_I]], i32 [[TMP_1_I]], i32 [[TMP_3_I]] |
| ; CHECK-NEXT: store i32 [[TMP_4]], i32* [[X]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %tmp.1.i = load i32, i32* %y ; <i32> [#uses=1] |
| %tmp.3.i = load i32, i32* %x ; <i32> [#uses=1] |
| %tmp.4.i = icmp slt i32 %tmp.1.i, %tmp.3.i ; <i1> [#uses=1] |
| %retval.i = select i1 %tmp.4.i, i32* %y, i32* %x ; <i32*> [#uses=1] |
| %tmp.4 = load i32, i32* %retval.i ; <i32> [#uses=1] |
| store i32 %tmp.4, i32* %x |
| ret void |
| } |
| |
| define void @_Z5test2RiS_(i32* %x, i32* %y) { |
| ; CHECK-LABEL: @_Z5test2RiS_( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP_2:%.*]] = load i32, i32* [[X:%.*]], align 4 |
| ; CHECK-NEXT: [[TMP_3_I:%.*]] = load i32, i32* [[Y:%.*]], align 4 |
| ; CHECK-NEXT: [[TMP_4_I:%.*]] = icmp slt i32 [[TMP_2]], [[TMP_3_I]] |
| ; CHECK-NEXT: [[TMP_6:%.*]] = select i1 [[TMP_4_I]], i32 [[TMP_3_I]], i32 [[TMP_2]] |
| ; CHECK-NEXT: store i32 [[TMP_6]], i32* [[Y]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %tmp.0 = alloca i32 ; <i32*> [#uses=2] |
| %tmp.2 = load i32, i32* %x ; <i32> [#uses=2] |
| store i32 %tmp.2, i32* %tmp.0 |
| %tmp.3.i = load i32, i32* %y ; <i32> [#uses=1] |
| %tmp.4.i = icmp slt i32 %tmp.2, %tmp.3.i ; <i1> [#uses=1] |
| %retval.i = select i1 %tmp.4.i, i32* %y, i32* %tmp.0 ; <i32*> [#uses=1] |
| %tmp.6 = load i32, i32* %retval.i ; <i32> [#uses=1] |
| store i32 %tmp.6, i32* %y |
| ret void |
| } |
| |