mirror of
https://github.com/RPCS3/llvm.git
synced 2026-08-27 21:00:01 -04:00
Anna Thomas
ec761ad75c
Summary: We have a bug when RAUWing the condition if experimental.guard or assumes is a use of that condition. This is because LazyValueInfo may have used the guards/assumes to identify the value of the condition at the end of the block. RAUW replaces the uses at the guard/assume as well as uses before the guard/assume. Both of these are incorrect. For now, disable RAUW for conditions and fix the logic as a next step: https://reviews.llvm.org/D33257 Reviewers: sanjoy, reames, trentxintong Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D33279 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303349 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
2.9 KiB
LLVM
113 lines
2.9 KiB
LLVM
; RUN: opt -S -jump-threading -dce < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: nounwind uwtable
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define i32 @test1(i32 %a, i32 %b) #0 {
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entry:
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%cmp = icmp sgt i32 %a, 5
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tail call void @llvm.assume(i1 %cmp)
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%cmp1 = icmp sgt i32 %b, 1234
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br i1 %cmp1, label %if.then, label %if.else
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; CHECK-LABEL: @test1
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; CHECK: icmp sgt i32 %a, 5
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; CHECK: call void @llvm.assume
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; CHECK-NOT: icmp sgt i32 %a, 3
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; CHECK: ret i32
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if.then: ; preds = %entry
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%cmp2 = icmp sgt i32 %a, 3
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br i1 %cmp2, label %if.then3, label %return
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if.then3: ; preds = %if.then
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tail call void (...) @bar() #1
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br label %return
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if.else: ; preds = %entry
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tail call void (...) @car() #1
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br label %return
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return: ; preds = %if.else, %if.then, %if.then3
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%retval.0 = phi i32 [ 1, %if.then3 ], [ 0, %if.then ], [ 0, %if.else ]
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ret i32 %retval.0
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}
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define i32 @test2(i32 %a) #0 {
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entry:
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%cmp = icmp sgt i32 %a, 5
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tail call void @llvm.assume(i1 %cmp)
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%cmp1 = icmp sgt i32 %a, 3
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br i1 %cmp1, label %if.then, label %return
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; CHECK-LABEL: @test2
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; CHECK: icmp sgt i32 %a, 5
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; CHECK: tail call void @llvm.assume
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; CHECK: tail call void (...) @bar()
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; CHECK: ret i32 1
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if.then: ; preds = %entry
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tail call void (...) @bar() #1
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br label %return
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return: ; preds = %entry, %if.then
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%retval.0 = phi i32 [ 1, %if.then ], [ 0, %entry ]
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ret i32 %retval.0
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}
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@g = external global i32
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; Check that we do prove a fact using an assume within the block.
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; FIXME: We can fold the assume based on the semantics of assume.
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; CHECK-LABEL: @can_fold_assume
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; CHECK: %notnull = icmp ne i32* %array, null
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; CHECK-NEXT: call void @llvm.assume(i1 %notnull)
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; CHECK-NEXT: ret void
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define void @can_fold_assume(i32* %array) {
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%notnull = icmp ne i32* %array, null
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call void @llvm.assume(i1 %notnull)
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br i1 %notnull, label %normal, label %error
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normal:
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ret void
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error:
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store atomic i32 0, i32* @g unordered, align 4
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ret void
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}
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declare void @f(i1)
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declare void @exit()
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; We can fold the assume but not the uses before the assume.
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define void @dont_fold_incorrectly(i32* %array) {
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; CHECK-LABEL:@dont_fold_incorrectly
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; CHECK: @f(i1 %notnull)
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; CHECK-NEXT: exit()
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; CHECK-NEXT: assume(i1 %notnull)
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; CHECK-NEXT: ret void
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%notnull = icmp ne i32* %array, null
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call void @f(i1 %notnull)
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call void @exit()
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call void @llvm.assume(i1 %notnull)
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br i1 %notnull, label %normal, label %error
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normal:
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ret void
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error:
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store atomic i32 0, i32* @g unordered, align 4
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ret void
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}
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; Function Attrs: nounwind
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declare void @llvm.assume(i1) #1
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declare void @bar(...)
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declare void @car(...)
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind }
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