| ; REQUIRES: asserts |
| ; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s |
| ; RUN: opt -S -loop-unswitch -verify-loop-info -verify-dom-info < %s | FileCheck %s |
| ; RUN: opt -S -loop-unswitch -verify-loop-info -verify-dom-info -enable-mssa-loop-dependency=true -verify-memoryssa < %s | FileCheck %s |
| |
| ; STATS: 2 loop-unswitch - Number of switches unswitched |
| |
| ; CHECK: %1 = icmp eq i32 %c, 1 |
| ; CHECK-NEXT: br i1 %1, label %.split.us, label %..split_crit_edge |
| |
| ; CHECK: ..split_crit_edge: ; preds = %0 |
| ; CHECK-NEXT: br label %.split |
| |
| ; CHECK: .split.us: ; preds = %0 |
| ; CHECK-NEXT: br label %loop_begin.us |
| |
| ; CHECK: loop_begin.us: ; preds = %loop_begin.backedge.us, %.split.us |
| ; CHECK-NEXT: %var_val.us = load i32, i32* %var |
| ; CHECK-NEXT: switch i32 1, label %default.us-lcssa.us [ |
| ; CHECK-NEXT: i32 1, label %inc.us |
| |
| ; CHECK: inc.us: ; preds = %loop_begin.us |
| ; CHECK-NEXT: call void @incf() [[NOR_NUW:#[0-9]+]] |
| ; CHECK-NEXT: br label %loop_begin.backedge.us |
| |
| ; CHECK: .split: ; preds = %..split_crit_edge |
| ; CHECK-NEXT: %2 = icmp eq i32 %c, 2 |
| ; CHECK-NEXT: br i1 %2, label %.split.split.us, label %.split..split.split_crit_edge |
| |
| ; CHECK: .split..split.split_crit_edge: ; preds = %.split |
| ; CHECK-NEXT: br label %.split.split |
| |
| ; CHECK: .split.split.us: ; preds = %.split |
| ; CHECK-NEXT: br label %loop_begin.us1 |
| |
| ; CHECK: loop_begin.us1: ; preds = %loop_begin.backedge.us5, %.split.split.us |
| ; CHECK-NEXT: %var_val.us2 = load i32, i32* %var |
| ; CHECK-NEXT: switch i32 2, label %default.us-lcssa.us-lcssa.us [ |
| ; CHECK-NEXT: i32 1, label %inc.us4 |
| ; CHECK-NEXT: i32 2, label %dec.us3 |
| ; CHECK-NEXT: ] |
| |
| ; CHECK: dec.us3: ; preds = %loop_begin.us1 |
| ; CHECK-NEXT: call void @decf() [[NOR_NUW]] |
| ; CHECK-NEXT: br label %loop_begin.backedge.us5 |
| |
| ; CHECK: .split.split: ; preds = %.split..split.split_crit_edge |
| ; CHECK-NEXT: br label %loop_begin |
| |
| ; CHECK: loop_begin: ; preds = %loop_begin.backedge, %.split.split |
| ; CHECK-NEXT: %var_val = load i32, i32* %var |
| ; CHECK-NEXT: switch i32 %c, label %default.us-lcssa.us-lcssa [ |
| ; CHECK-NEXT: i32 1, label %inc |
| ; CHECK-NEXT: i32 2, label %dec |
| ; CHECK-NEXT: ] |
| |
| ; CHECK: inc: ; preds = %loop_begin |
| ; CHECK-NEXT: br i1 true, label %us-unreachable.us-lcssa, label %inc.split |
| |
| ; CHECK: dec: ; preds = %loop_begin |
| ; CHECK-NEXT: br i1 true, label %us-unreachable6, label %dec.split |
| |
| define i32 @test(i32* %var) { |
| %mem = alloca i32 |
| store i32 2, i32* %mem |
| %c = load i32, i32* %mem |
| |
| br label %loop_begin |
| |
| loop_begin: |
| |
| %var_val = load i32, i32* %var |
| |
| switch i32 %c, label %default [ |
| i32 1, label %inc |
| i32 2, label %dec |
| ] |
| |
| inc: |
| call void @incf() noreturn nounwind |
| br label %loop_begin |
| dec: |
| call void @decf() noreturn nounwind |
| br label %loop_begin |
| default: |
| br label %loop_exit |
| loop_exit: |
| ret i32 0 |
| } |
| |
| declare void @incf() noreturn |
| declare void @decf() noreturn |
| |
| ; CHECK: attributes #0 = { noreturn } |
| ; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind } |