convert to filecheck.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85734 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/InstCombine/phi.ll

@@ -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
+BB1:           
-        %Y = bitcast i32 %A to i32              ; <i32> [#uses=1]
+        %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]
+        %B = phi i32 [ %A, %BB0 ], [ %C, %Loop ]                
-        %C = add i32 %B, 123            ; <i32> [#uses=1]
+        %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
 }