58 lines · plain
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -S -passes=gvn -enable-split-backedge-in-load-pre=true < %s | FileCheck %s --check-prefix=ON3; RUN: opt -S -passes=gvn -enable-split-backedge-in-load-pre=false < %s | FileCheck %s --check-prefix=OFF4 5target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"6 7define i32 @test(i1 %b, i1 %c, ptr noalias %p, ptr noalias %q) {8; ON-LABEL: @test(9; ON-NEXT: entry:10; ON-NEXT: [[Y1:%.*]] = load i32, ptr [[P:%.*]], align 411; ON-NEXT: call void @use(i32 [[Y1]])12; ON-NEXT: br label [[HEADER:%.*]]13; ON: header:14; ON-NEXT: [[Y:%.*]] = phi i32 [ [[Y_PRE:%.*]], [[SKIP_HEADER_CRIT_EDGE:%.*]] ], [ [[Y]], [[HEADER]] ], [ [[Y1]], [[ENTRY:%.*]] ]15; ON-NEXT: call void @use(i32 [[Y]])16; ON-NEXT: br i1 [[B:%.*]], label [[SKIP:%.*]], label [[HEADER]]17; ON: skip:18; ON-NEXT: call void @clobber(ptr [[P]], ptr [[Q:%.*]])19; ON-NEXT: br i1 [[C:%.*]], label [[SKIP_HEADER_CRIT_EDGE]], label [[EXIT:%.*]]20; ON: skip.header_crit_edge:21; ON-NEXT: [[Y_PRE]] = load i32, ptr [[P]], align 422; ON-NEXT: br label [[HEADER]]23; ON: exit:24; ON-NEXT: ret i32 [[Y]]25;26; OFF-LABEL: @test(27; OFF-NEXT: entry:28; OFF-NEXT: [[Y1:%.*]] = load i32, ptr [[P:%.*]], align 429; OFF-NEXT: call void @use(i32 [[Y1]])30; OFF-NEXT: br label [[HEADER:%.*]]31; OFF: header:32; OFF-NEXT: [[Y:%.*]] = load i32, ptr [[P]], align 433; OFF-NEXT: call void @use(i32 [[Y]])34; OFF-NEXT: br i1 [[B:%.*]], label [[SKIP:%.*]], label [[HEADER]]35; OFF: skip:36; OFF-NEXT: call void @clobber(ptr [[P]], ptr [[Q:%.*]])37; OFF-NEXT: br i1 [[C:%.*]], label [[HEADER]], label [[EXIT:%.*]]38; OFF: exit:39; OFF-NEXT: ret i32 [[Y]]40;41entry:42 %y1 = load i32, ptr %p43 call void @use(i32 %y1)44 br label %header45header:46 %y = load i32, ptr %p47 call void @use(i32 %y)48 br i1 %b, label %skip, label %header49skip:50 call void @clobber(ptr %p, ptr %q)51 br i1 %c, label %header, label %exit52exit:53 ret i32 %y54}55 56declare void @use(i32) readonly57declare void @clobber(ptr %p, ptr %q)58