| ; RUN: opt -S -o - -basicaa -domtree -gvn %s | FileCheck %s |
| |
| target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" |
| |
| %struct.S1 = type { i32, i32 } |
| |
| @a2 = common global i32* null, align 8 |
| @a = common global i32* null, align 8 |
| @s1 = common global %struct.S1 zeroinitializer, align 8 |
| |
| ; Check that GVN doesn't determine %2 is partially redundant. |
| |
| ; CHECK-LABEL: define i32 @volatile_load |
| ; CHECK: for.body: |
| ; CHECK: %2 = load i32, i32* |
| ; CHECK: %3 = load volatile i32, i32* |
| ; CHECK: for.cond.for.end_crit_edge: |
| |
| define i32 @volatile_load(i32 %n) { |
| entry: |
| %cmp6 = icmp sgt i32 %n, 0 |
| br i1 %cmp6, label %for.body.lr.ph, label %for.end |
| |
| for.body.lr.ph: |
| %0 = load i32*, i32** @a2, align 8, !tbaa !1 |
| %1 = load i32*, i32** @a, align 8, !tbaa !1 |
| br label %for.body |
| |
| for.body: |
| %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ] |
| %s.09 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ] |
| %p.08 = phi i32* [ %0, %for.body.lr.ph ], [ %incdec.ptr, %for.body ] |
| %2 = load i32, i32* %p.08, align 4, !tbaa !5 |
| %arrayidx = getelementptr inbounds i32, i32* %1, i64 %indvars.iv |
| store i32 %2, i32* %arrayidx, align 4, !tbaa !5 |
| %3 = load volatile i32, i32* %p.08, align 4, !tbaa !5 |
| %add = add nsw i32 %3, %s.09 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %incdec.ptr = getelementptr inbounds i32, i32* %p.08, i64 1 |
| %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| %exitcond = icmp ne i32 %lftr.wideiv, %n |
| br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge |
| |
| for.cond.for.end_crit_edge: |
| %add.lcssa = phi i32 [ %add, %for.body ] |
| br label %for.end |
| |
| for.end: |
| %s.0.lcssa = phi i32 [ %add.lcssa, %for.cond.for.end_crit_edge ], [ 0, %entry ] |
| ret i32 %s.0.lcssa |
| } |
| |
| ; %1 is partially redundant if %0 can be widened to a 64-bit load. |
| ; But we should not widen %0 to 64-bit load. |
| |
| ; CHECK-LABEL: define i32 @overaligned_load |
| ; CHECK: if.then: |
| ; CHECK-NOT: %0 = load i64 |
| ; CHECK-NOT: [[LSHR:%[0-9]+]] = lshr i64 %0, 32, !dbg [[LSHR_LOC:![0-9]+]] |
| ; CHECK-NOT: trunc i64 [[LSHR]] to i32 |
| ; CHECK: if.end: |
| ; CHECK: %1 = load i32, i32* |
| ; CHECK-NOT: [[LSHR_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}}) |
| |
| define i32 @overaligned_load(i32 %a, i32* nocapture %b) !dbg !13 { |
| entry: |
| %cmp = icmp sgt i32 %a, 0, !dbg !14 |
| br i1 %cmp, label %if.then, label %if.else, !dbg !14 |
| |
| if.then: |
| %0 = load i32, i32* getelementptr inbounds (%struct.S1, %struct.S1* @s1, i64 0, i32 0), align 8, !tbaa !5, !dbg !15 |
| br label %if.end, !dbg !15 |
| |
| if.else: |
| %arrayidx = getelementptr inbounds i32, i32* %b, i64 2, !dbg !16 |
| store i32 10, i32* %arrayidx, align 4, !tbaa !5, !dbg !16 |
| br label %if.end, !dbg !16 |
| |
| if.end: |
| %i.0 = phi i32 [ %0, %if.then ], [ 0, %if.else ] |
| %p.0 = phi i32* [ getelementptr inbounds (%struct.S1, %struct.S1* @s1, i64 0, i32 0), %if.then ], [ %b, %if.else ] |
| %add.ptr = getelementptr inbounds i32, i32* %p.0, i64 1, !dbg !17 |
| %1 = load i32, i32* %add.ptr, align 4, !tbaa !5, !dbg !17 |
| %add1 = add nsw i32 %1, %i.0, !dbg !17 |
| ret i32 %add1, !dbg !17 |
| } |
| |
| !1 = !{!2, !2, i64 0} |
| !2 = !{!"any pointer", !3, i64 0} |
| !3 = !{!"omnipotent char", !4, i64 0} |
| !4 = !{!"Simple C/C++ TBAA"} |
| !5 = !{!6, !6, i64 0} |
| !6 = !{!"int", !3, i64 0} |
| |
| !llvm.module.flags = !{!7, !8, !9} |
| !llvm.dbg.cu = !{!18} |
| !7 = !{i32 2, !"Dwarf Version", i32 4} |
| !8 = !{i32 2, !"Debug Info Version", i32 3} |
| !9 = !{i32 1, !"PIC Level", i32 2} |
| |
| !10 = !{} |
| !11 = !DISubroutineType(types: !10) |
| !12 = !DIFile(filename: "test.cpp", directory: "/tmp") |
| !13 = distinct !DISubprogram(name: "test", scope: !12, file: !12, line: 99, type: !11, isLocal: false, isDefinition: true, scopeLine: 100, flags: DIFlagPrototyped, isOptimized: false, unit: !18, retainedNodes: !10) |
| !14 = !DILocation(line: 100, column: 1, scope: !13) |
| !15 = !DILocation(line: 101, column: 1, scope: !13) |
| !16 = !DILocation(line: 102, column: 1, scope: !13) |
| !17 = !DILocation(line: 103, column: 1, scope: !13) |
| !18 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang", |
| file: !12, |
| isOptimized: true, flags: "-O2", |
| splitDebugFilename: "abc.debug", emissionKind: 2) |