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