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00cf3d4d68
This is a follow-up to D29395 where we try to be good citizens and let the user know that we've probably gone off the rails. This should allow us to resolve: https://llvm.org/bugs/show_bug.cgi?id=31809 Differential Revision: https://reviews.llvm.org/D29404 llvm-svn: 294208
73 lines
2.7 KiB
LLVM
73 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by update_test_checks.py
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; RUN: opt -instsimplify -S < %s 2>&1 -pass-remarks-analysis=.* | FileCheck %s
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; Verify that warnings are emitted for the 2nd and 3rd tests.
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; CHECK: remark: /tmp/s.c:1:13: Detected conflicting code assumptions.
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; CHECK: remark: /tmp/s.c:4:10: Detected conflicting code assumptions.
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define void @test1() {
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; CHECK-LABEL: @test1(
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; CHECK: ret void
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;
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call void @llvm.assume(i1 1)
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ret void
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}
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; The alloca guarantees that the low bits of %a are zero because of alignment.
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; The assume says the opposite. The assume is processed last, so that's the
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; return value. There's no way to win (we can't undo transforms that happened
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; based on half-truths), so just don't crash.
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define i64 @PR31809() !dbg !7 {
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; CHECK-LABEL: @PR31809(
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; CHECK-NEXT: ret i64 3
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;
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%a = alloca i32
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%t1 = ptrtoint i32* %a to i64, !dbg !9
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%cond = icmp eq i64 %t1, 3
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call void @llvm.assume(i1 %cond)
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ret i64 %t1
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}
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; Similar to above: there's no way to know which assumption is truthful,
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; so just don't crash. The second icmp+assume gets processed later, so that
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; determines the return value.
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define i8 @conflicting_assumptions(i8 %x) !dbg !10 {
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; CHECK-LABEL: @conflicting_assumptions(
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; CHECK-NEXT: call void @llvm.assume(i1 false)
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; CHECK-NEXT: [[COND2:%.*]] = icmp eq i8 %x, 4
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; CHECK-NEXT: call void @llvm.assume(i1 [[COND2]])
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; CHECK-NEXT: ret i8 5
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;
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%add = add i8 %x, 1, !dbg !11
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%cond1 = icmp eq i8 %x, 3
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call void @llvm.assume(i1 %cond1)
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%cond2 = icmp eq i8 %x, 4
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call void @llvm.assume(i1 %cond2)
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ret i8 %add
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}
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declare void @llvm.assume(i1) nounwind
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
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!1 = !DIFile(filename: "/tmp/s.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"PIC Level", i32 2}
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!6 = !{!"clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, variables: !2)
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!8 = !DISubroutineType(types: !2)
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!9 = !DILocation(line: 1, column: 13, scope: !7)
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!10 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, variables: !2)
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!11 = !DILocation(line: 4, column: 10, scope: !10)
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!12 = !DILocation(line: 4, column: 3, scope: !10)
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