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use getPredicateOnEdge to fold comparisons through PHI nodes,

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which implements GCC PR18046.  This also gets us 360 more
jump threads on 176.gcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-11-12 05:24:05 +00:00
parent f496e79f44
commit 66c04c48de
2 changed files with 43 additions and 1 deletions
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test/Transforms/JumpThreading/basic.ll
+32
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@@ -349,6 +349,38 @@ BB4:
ret i32 4
}
;; Correlated value through boolean expression. GCC PR18046.
define void @test12(i32 %A) {
; CHECK: @test12
entry:
%cond = icmp eq i32 %A, 0
br i1 %cond, label %bb, label %bb1
; Should branch to the return block instead of through BB1.
; CHECK: entry:
; CHECK-NEXT: %cond = icmp eq i32 %A, 0
; CHECK-NEXT: br i1 %cond, label %bb1, label %return
bb:
%B = call i32 @test10f2()
br label %bb1
bb1:
%C = phi i32 [ %A, %entry ], [ %B, %bb ]
%cond4 = icmp eq i32 %C, 0
br i1 %cond4, label %bb2, label %return
; CHECK: bb1:
; CHECK-NEXT: %B = call i32 @test10f2()
; CHECK-NEXT: %cond4 = icmp eq i32 %B, 0
; CHECK-NEXT: br i1 %cond4, label %bb2, label %return
bb2:
%D = call i32 @test10f2()
ret void
return:
ret void
}
;;; Duplicate condition to avoid xor of cond.