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convert to filecheck.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85734 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-01 19:22:20 +00:00
parent 857e9996c7
commit c7e4e6edc4
1 changed files with 49 additions and 20 deletions
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69
test/Transforms/InstCombine/phi.ll
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@ -1,44 +1,53 @@
; This test makes sure that these instructions are properly eliminated.
;
; RUN: opt < %s -instcombine -S | not grep phi
; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @test1(i32 %A, i1 %b) {
BB0:
br i1 %b, label %BB1, label %BB2
BB1: ; preds = %BB0
BB1:
; Combine away one argument PHI nodes
%B = phi i32 [ %A, %BB0 ] ; <i32> [#uses=1]
%B = phi i32 [ %A, %BB0 ]
ret i32 %B
BB2: ; preds = %BB0
BB2:
ret i32 %A
; CHECK: @test1
; CHECK: BB1:
; CHECK-NEXT: ret i32 %A
}
define i32 @test2(i32 %A, i1 %b) {
BB0:
br i1 %b, label %BB1, label %BB2
BB1: ; preds = %BB0
BB1:
br label %BB2
BB2: ; preds = %BB1, %BB0
BB2:
; Combine away PHI nodes with same values
%B = phi i32 [ %A, %BB0 ], [ %A, %BB1 ] ; <i32> [#uses=1]
%B = phi i32 [ %A, %BB0 ], [ %A, %BB1 ]
ret i32 %B
; CHECK: @test2
; CHECK: BB2:
; CHECK-NEXT: ret i32 %A
}
define i32 @test3(i32 %A, i1 %b) {
BB0:
br label %Loop
Loop: ; preds = %Loop, %BB0
Loop:
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ %B, %Loop ] ; <i32> [#uses=2]
%B = phi i32 [ %A, %BB0 ], [ %B, %Loop ]
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
Exit:
ret i32 %B
; CHECK: @test3
; CHECK: Exit:
; CHECK-NEXT: ret i32 %A
}
define i32 @test4(i1 %b) {
@ -48,11 +57,14 @@ BB0:
Loop: ; preds = %L2, %Loop
; PHI has same value always.
%B = phi i32 [ %B, %L2 ], [ %B, %Loop ] ; <i32> [#uses=2]
%B = phi i32 [ %B, %L2 ], [ %B, %Loop ]
br i1 %b, label %L2, label %Loop
L2: ; preds = %Loop
br label %Loop
; CHECK: @test4
; CHECK: Loop:
; CHECK-NEXT: br i1 %b
}
define i32 @test5(i32 %A, i1 %b) {
@ -61,26 +73,35 @@ BB0:
Loop: ; preds = %Loop, %BB0
; PHI has same value always.
%B = phi i32 [ %A, %BB0 ], [ undef, %Loop ] ; <i32> [#uses=1]
%B = phi i32 [ %A, %BB0 ], [ undef, %Loop ]
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i32 %B
; CHECK: @test5
; CHECK: Loop:
; CHECK-NEXT: br i1 %b
; CHECK: Exit:
; CHECK-NEXT: ret i32 %A
}
define i32 @test6(i32 %A, i1 %b) {
define i32 @test6(i16 %A, i1 %b) {
BB0:
%X = bitcast i32 %A to i32 ; <i32> [#uses=1]
%X = zext i16 %A to i32
br i1 %b, label %BB1, label %BB2
BB1: ; preds = %BB0
%Y = bitcast i32 %A to i32 ; <i32> [#uses=1]
BB1:
%Y = zext i16 %A to i32
br label %BB2
BB2: ; preds = %BB1, %BB0
BB2:
;; Suck casts into phi
%B = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ] ; <i32> [#uses=1]
%B = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32 %B
; CHECK: @test6
; CHECK: BB2:
; CHECK: zext i16 %A to i32
; CHECK-NEXT: ret i32
}
define i32 @test7(i32 %A, i1 %b) {
@ -89,12 +110,15 @@ BB0:
Loop: ; preds = %Loop, %BB0
; PHI is dead.
%B = phi i32 [ %A, %BB0 ], [ %C, %Loop ] ; <i32> [#uses=1]
%C = add i32 %B, 123 ; <i32> [#uses=1]
%B = phi i32 [ %A, %BB0 ], [ %C, %Loop ]
%C = add i32 %B, 123
br i1 %b, label %Loop, label %Exit
Exit: ; preds = %Loop
ret i32 0
; CHECK: @test7
; CHECK: Loop:
; CHECK-NEXT: br i1 %b
}
define i32* @test8({ i32, i32 } *%A, i1 %b) {
@ -110,6 +134,11 @@ BB2:
;; Suck GEPs into phi
%B = phi i32* [ %X, %BB0 ], [ %Y, %BB1 ]
ret i32* %B
; CHECK: @test8
; CHECK-NOT: phi
; CHECK: BB2:
; CHECK-NEXT: %B = getelementptr
; CHECK-NEXT: ret i32* %B
}