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Add a micro-test for the transforms I added to JumpThreading.

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I have not been able to find a way to test each in isolation, for a few reasons:
1) The ability to look-through non-i1 BinaryOperator's requires the ability to look through non-constant
   ICmps in order for it to ever trigger.
2) The ability to do LVI-powered PHI value determination only matters in cases that ProcessBranchOnPHI
   can't handle.  Since it already handles all the cases without other instructions in the def-use chain
   between the PHI and the branch, it requires the ability to look through ICmps and/or BinaryOperators
   as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112611 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-08-31 17:59:07 +00:00
parent 85e75afc8e
commit 421cc4c999
1 changed files with 30 additions and 0 deletions
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30
test/Transforms/JumpThreading/basic.ll
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@ -421,4 +421,34 @@ F2:
; CHECK-NEXT: br i1 %N, label %T2, label %F2
}
; CHECK: @test14
define i32 @test14(i32 %in) {
entry:
%A = icmp eq i32 %in, 0
; CHECK: br i1 %A, label %right_ret, label %merge
br i1 %A, label %left, label %right
; CHECK-NOT: left:
left:
br label %merge
; CHECK-NOT: right:
right:
%B = call i32 @f1()
br label %merge
merge:
; CHECK-NOT: %C = phi i32 [%in, %left], [%B, %right]
%C = phi i32 [%in, %left], [%B, %right]
%D = add i32 %C, 1
%E = icmp eq i32 %D, 2
br i1 %E, label %left_ret, label %right_ret
; CHECK: left_ret:
left_ret:
ret i32 0
right_ret:
ret i32 1
}