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[JumpThread] Do RAUW in case Cond folds to a constant in the CFG

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Summary: [JumpThread] Do RAUW in case Cond folds to a constant in the CFG

Reviewers: sanjoy

Reviewed By: sanjoy

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32407

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301804 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Xin Tong
2017-05-01 15:34:17 +00:00
parent 195d3fa988
commit fc533c3fb3
2 changed files with 81 additions and 8 deletions
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test/Transforms/JumpThreading/fold-not-thread.ll
+57
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@@ -133,3 +133,60 @@ L3:
ret void
}
; Make sure we can do the RAUW for %add...
;
; CHECK-LABEL: @rauw_if_possible(
; CHECK: call void @f4(i32 96)
define void @rauw_if_possible(i32 %value) nounwind {
entry:
%cmp = icmp eq i32 %value, 32
br i1 %cmp, label %L0, label %L3
L0:
call i32 @f2()
call i32 @f2()
%add = add i32 %value, 64
switch i32 %add, label %L3 [
i32 32, label %L1
i32 96, label %L2
]
L1:
call void @f3()
ret void
L2:
call void @f4(i32 %add)
ret void
L3:
call void @f3()
ret void
}
; Make sure we can NOT do the RAUW for %add...
;
; CHECK-LABEL: @rauw_if_possible2(
; CHECK: call void @f4(i32 %add)
define void @rauw_if_possible2(i32 %value) nounwind {
entry:
%cmp = icmp eq i32 %value, 32
%add = add i32 %value, 64
br i1 %cmp, label %L0, label %L2
L0:
call i32 @f2()
call i32 @f2()
switch i32 %add, label %L3 [
i32 32, label %L1
i32 96, label %L2
]
L1:
call void @f3()
ret void
L2:
call void @f4(i32 %add)
ret void
L3:
call void @f3()
ret void
}