[GVN] Use FileCheck instead of grep for tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275739 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/GVN/2007-07-25-InfiniteLoop.ll b/test/Transforms/GVN/2007-07-25-InfiniteLoop.ll
index 0ffb34c39b4f27c66382920710e88d49b2b5e282..98fb6b3c382ec3de78343896b15e911e624e25b3 100644 (file)
--- a/test/Transforms/GVN/2007-07-25-InfiniteLoop.ll
+++ b/test/Transforms/GVN/2007-07-25-InfiniteLoop.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -S | not grep "tmp10 ="
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 
        %struct.INT2 = type { i32, i32 }
 @blkshifts = external global %struct.INT2*             ; <%struct.INT2**> [#uses=2]
@@ -10,5 +10,6 @@ entry:
 
 bb:            ; preds = %bb, %entry
        %tmp10 = load %struct.INT2*, %struct.INT2** @blkshifts, align 4         ; <%struct.INT2*> [#uses=0]
+; CHECK-NOT:  %tmp10
        br label %bb
 }

diff --git a/test/Transforms/GVN/2007-07-26-PhiErasure.ll b/test/Transforms/GVN/2007-07-26-PhiErasure.ll
index 82af521ab3d67b8b07d56e035d47f9a4b139b7b4..e9dab2bbac0cd65481104cf1229246b975b285ce 100644 (file)
--- a/test/Transforms/GVN/2007-07-26-PhiErasure.ll
+++ b/test/Transforms/GVN/2007-07-26-PhiErasure.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -gvn -S | not grep phi
+; RUN: opt < %s -gvn -S | FileCheck %s
 
        %struct..0anon = type { i32 }
        %struct.FILE = type { i8*, i32, i32, i16, i16, %struct.__sbuf, i32, i8*, i32 (i8*)*, i32 (i8*, i8*, i32)*, i64 (i8*, i64, i32)*, i32 (i8*, i8*, i32)*, %struct.__sbuf, %struct.__sFILEX*, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64 }
@@ -26,3 +26,19 @@ bb2982.preheader:            ; preds = %cond_next2943
        ret i32 %tmp298316
 
 }
+
+; CHECK: define i32 @reload(%struct.rtx_def* %first, i32 %global, %struct.FILE* %dumpfile) {
+; CHECK-NEXT: cond_next2835.1:
+; CHECK-NEXT:   br label %bb2928
+; CHECK: bb2928:
+; CHECK-NEXT:   br i1 false, label %bb2928.cond_next2943_crit_edge, label %cond_true2935
+; CHECK: bb2928.cond_next2943_crit_edge:
+; CHECK-NEXT:   br label %cond_next2943
+; CHECK: cond_true2935:
+; CHECK-NEXT:   br label %cond_next2943
+; CHECK: cond_next2943:
+; CHECK-NEXT:   br i1 false, label %bb2982.preheader, label %bb2928
+; CHECK: bb2982.preheader:
+; CHECK-NEXT:   %tmp298316 = load i32, i32* @n_spills, align 4
+; CHECK-NEXT:   ret i32 %tmp298316
+; CHECK-NEXT: }

diff --git a/test/Transforms/GVN/2007-07-31-NoDomInherit.ll b/test/Transforms/GVN/2007-07-31-NoDomInherit.ll
index b2e4c64ee77005e247c9476da720658f8f3299d5..ebd6ea247ef53b5b9b78320615be5159067e081a 100644 (file)
--- a/test/Transforms/GVN/2007-07-31-NoDomInherit.ll
+++ b/test/Transforms/GVN/2007-07-31-NoDomInherit.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -S | grep "tmp47 = phi i32 "
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 
        %struct.anon = type { i32 (i32, i32, i32)*, i32, i32, [3 x i32], i8*, i8*, i8* }
 @debug = external constant i32         ; <i32*> [#uses=0]
@@ -214,6 +214,7 @@ bb18:               ; preds = %bb49
        %tmp46 = load i32, i32* %i              ; <i32> [#uses=1]
        call void @fix_operands( i32 %tmp46 )
        %tmp47 = load i32, i32* %i              ; <i32> [#uses=1]
+; CHECK: %tmp47 = phi i32 [ %tmp48, %bb18 ], [ 0, %bb17 ]
        %tmp48 = add i32 %tmp47, 1              ; <i32> [#uses=1]
        store i32 %tmp48, i32* %i
        br label %bb49

diff --git a/test/Transforms/GVN/2007-07-31-RedundantPhi.ll b/test/Transforms/GVN/2007-07-31-RedundantPhi.ll
index b285560e6a99e52ddd0ae2613b28deb765f91936..11ec736d2dffd0202fb510d0a0bb26e5c4f62b71 100644 (file)
--- a/test/Transforms/GVN/2007-07-31-RedundantPhi.ll
+++ b/test/Transforms/GVN/2007-07-31-RedundantPhi.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -S | not grep "tmp701 ="
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 
 @img_width = external global i16               ; <i16*> [#uses=2]
 
@@ -18,5 +18,6 @@ cond_false470:                ; preds = %cond_next449
 
 cond_next698:          ; preds = %cond_true492
        %tmp701 = load i16, i16* @img_width, align 2            ; <i16> [#uses=0]
+; CHECK-NOT: %tmp701 =
        ret i32 0
 }

diff --git a/test/Transforms/GVN/2008-02-12-UndefLoad.ll b/test/Transforms/GVN/2008-02-12-UndefLoad.ll
index a1aed867ec63382a077a6ad02cb07b2673cbc82f..0e6b17c4aa50fa0bacb4f7bc8441d3dc99f0d845 100644 (file)
--- a/test/Transforms/GVN/2008-02-12-UndefLoad.ll
+++ b/test/Transforms/GVN/2008-02-12-UndefLoad.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -gvn -S | not grep load
+; RUN: opt < %s -gvn -S | FileCheck %s
 ; PR1996
 
 %struct.anon = type { i32, i8, i8, i8, i8 }
@@ -9,6 +9,7 @@ entry:
         %tmp = getelementptr %struct.anon, %struct.anon* %c, i32 0, i32 0             ; <i32*> [#uses=1]
         %tmp1 = getelementptr i32, i32* %tmp, i32 1          ; <i32*> [#uses=2]
         %tmp2 = load i32, i32* %tmp1, align 4                ; <i32> [#uses=1]
+; CHECK-NOT: load
         %tmp3 = or i32 %tmp2, 11                ; <i32> [#uses=1]
         %tmp4 = and i32 %tmp3, -21              ; <i32> [#uses=1]
         store i32 %tmp4, i32* %tmp1, align 4

diff --git a/test/Transforms/GVN/2008-07-02-Unreachable.ll b/test/Transforms/GVN/2008-07-02-Unreachable.ll
index d9932644da3e65d954304102fef42d00046b5039..0cd80e8da0c7e38a6df1f4b993082df6d650c5c5 100644 (file)
--- a/test/Transforms/GVN/2008-07-02-Unreachable.ll
+++ b/test/Transforms/GVN/2008-07-02-Unreachable.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -S | grep "ret i8 [%]tmp3"
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 ; PR2503
 
 @g_3 = external global i8              ; <i8*> [#uses=2]
@@ -29,6 +29,7 @@ forinc:               ; preds = %forbody
 afterfor:              ; preds = %forcond, %forcond.thread
        %tmp10 = load i8, i8* @g_3              ; <i8> [#uses=0]
        ret i8 %tmp10
+; CHECK: ret i8 %tmp3
 
 ifend:         ; preds = %afterfor, %ifthen
        ret i8 0

diff --git a/test/Transforms/GVN/2008-12-09-SelfRemove.ll b/test/Transforms/GVN/2008-12-09-SelfRemove.ll
index d8ab1bae48e97b3af3b4e0365049cf265a885408..b0468b4def6b063a896dfd5810d6cc2852e26a72 100644 (file)
--- a/test/Transforms/GVN/2008-12-09-SelfRemove.ll
+++ b/test/Transforms/GVN/2008-12-09-SelfRemove.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -gvn -S | grep getelementptr | count 1
+; RUN: opt < %s -gvn -S | FileCheck %s
 
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
 target triple = "i386-apple-darwin9.5"
@@ -24,3 +24,15 @@ bb21:                ; preds = %bb21, %bb
 return:                ; preds = %entry
        ret void
 }
+
+; CHECK: define void @d_print_mod_list(%struct.d_print_info* %dpi, %struct.d_print_mod* %mods, i32 %suffix) #0 {
+; CHECK: entry:
+; CHECK:   %0 = getelementptr %struct.d_print_info, %struct.d_print_info* %dpi, i32 0, i32 1
+; CHECK:   br i1 false, label %return, label %bb
+; CHECK: bb:
+; CHECK:   br label %bb21
+; CHECK: bb21:
+; CHECK:   br label %bb21
+; CHECK: return:
+; CHECK:   ret void
+; CHECK: }

diff --git a/test/Transforms/GVN/2009-06-17-InvalidPRE.ll b/test/Transforms/GVN/2009-06-17-InvalidPRE.ll
index bf0a234da4acc92640cf62380d4be6403db53dea..ec592b0e9e848ff8d9c6464c46e262ff781fd223 100644 (file)
--- a/test/Transforms/GVN/2009-06-17-InvalidPRE.ll
+++ b/test/Transforms/GVN/2009-06-17-InvalidPRE.ll
@@ -1,4 +1,5 @@
-; RUN: opt < %s -gvn -enable-load-pre -S | not grep pre1
+; RUN: opt < %s -gvn -enable-load-pre -S | FileCheck %s
+; CHECK-NOT: pre1
 ; GVN load pre was hoisting the loads at %13 and %16 up to bb4.outer.  
 ; This is invalid as it bypasses the check for %m.0.ph==null in bb4. 
 ; ModuleID = 'mbuf.c'

diff --git a/test/Transforms/GVN/basic.ll b/test/Transforms/GVN/basic.ll
index 3e74f50990ef0f8e0f99e03bc0990916c2191f1c..44b321306319a3e69180c343a9f9f22897231e64 100644 (file)
--- a/test/Transforms/GVN/basic.ll
+++ b/test/Transforms/GVN/basic.ll
@@ -1,5 +1,5 @@
-; RUN: opt < %s -gvn -S | not grep "%z2 ="
-; RUN: opt < %s -passes=gvn -S | not grep "%z2 ="
+; RUN: opt < %s -gvn -S | FileCheck %s
+; RUN: opt < %s -passes=gvn -S | FileCheck %s
 
 define i32 @main() {
 block1:
@@ -9,3 +9,8 @@ block2:
   %z2 = bitcast i32 0 to i32
   ret i32 %z2
 }
+
+; CHECK: define i32 @main() {
+; CHECK-NEXT: block1:
+; CHECK-NEXT:   ret i32 0
+; CHECK-NEXT: }

diff --git a/test/Transforms/GVN/bitcast-of-call.ll b/test/Transforms/GVN/bitcast-of-call.ll
index 55b4b6e9d317db1c33727cb5d69fb81e7300958d..930e4d7373d3b408b74c9c0d2413ddb3d91f0347 100644 (file)
--- a/test/Transforms/GVN/bitcast-of-call.ll
+++ b/test/Transforms/GVN/bitcast-of-call.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -gvn -S | not grep tmp2
+; RUN: opt < %s -gvn -S | FileCheck %s
 ; PR2213
 
 define i32* @f(i8* %x) {
@@ -6,6 +6,7 @@ entry:
         %tmp = call i8* @m( i32 12 )            ; <i8*> [#uses=2]
         %tmp1 = bitcast i8* %tmp to i32*                ; <i32*> [#uses=0]
         %tmp2 = bitcast i8* %tmp to i32*                ; <i32*> [#uses=0]
+; CHECK-NOT: %tmp2
         ret i32* %tmp2
 }
 

diff --git a/test/Transforms/GVN/calls-nonlocal.ll b/test/Transforms/GVN/calls-nonlocal.ll
index 24ef2e9ec412129dca6404cdfc754284b9f2ad69..d3c03d6c78d75a199572d3e2de367d5fe2799678 100644 (file)
--- a/test/Transforms/GVN/calls-nonlocal.ll
+++ b/test/Transforms/GVN/calls-nonlocal.ll
@@ -1,4 +1,5 @@
-; RUN: opt < %s -basicaa -gvn -S | grep strlen | count 2
+; Two occurrences of strlen should be zapped.
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
 target triple = "i386-apple-darwin9"
 
@@ -46,4 +47,29 @@ return:              ; preds = %bb27
        ret i32 %tmp.0
 }
 
+; CHECK: define i32 @test(i32 %g, i8* %P) #0 {
+; CHECK: entry:
+; CHECK:   %tmp2 = call i32 @strlen(i8* %P) #1
+; CHECK:   %tmp3 = icmp eq i32 %tmp2, 100
+; CHECK:   %tmp34 = zext i1 %tmp3 to i8
+; CHECK:   br i1 %tmp3, label %bb, label %bb6
+; CHECK: bb:
+; CHECK:   br label %bb27
+; CHECK: bb6:
+; CHECK:   %tmp8 = add i32 %g, 42
+; CHECK:   br i1 false, label %bb14, label %bb16
+; CHECK: bb14:
+; CHECK:   br label %bb27
+; CHECK: bb16:
+; CHECK:   %tmp18 = mul i32 %tmp8, 2
+; CHECK:   br i1 false, label %bb24, label %bb26
+; CHECK: bb24:
+; CHECK:   br label %bb27
+; CHECK: bb26:
+; CHECK:   br label %bb27
+; CHECK: bb27:
+; CHECK:   %tmp.0 = phi i32 [ 11, %bb26 ], [ undef, %bb24 ], [ undef, %bb14 ], [ %g, %bb ]
+; CHECK:   ret i32 %tmp.0
+; CHECK: }
+
 declare i32 @strlen(i8*) nounwind readonly 

diff --git a/test/Transforms/GVN/calls-readonly.ll b/test/Transforms/GVN/calls-readonly.ll
index ba8ad661eabfd94f1748d46c3f2ff38037bfdade..35b69d49ac7183f502276f1c04eef5e24c4c582c 100644 (file)
--- a/test/Transforms/GVN/calls-readonly.ll
+++ b/test/Transforms/GVN/calls-readonly.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -S | grep "call.*strlen" | count 1
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 ; Should delete the second call to strlen even though the intervening strchr call exists.
 
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
@@ -24,6 +24,22 @@ bb1:                                              ; preds = %bb, %entry
   ret i8* %6
 }
 
+; CHECK: define i8* @test(i8* %P, i8* %Q, i32 %x, i32 %y) #0 {
+; CHECK: entry:
+; CHECK-NEXT:   %0 = tail call i32 @strlen(i8* %P)
+; CHECK-NEXT:   %1 = icmp eq i32 %0, 0
+; CHECK-NEXT:   br i1 %1, label %bb, label %bb1
+; CHECK: bb:
+; CHECK-NEXT:   %2 = sdiv i32 %x, %y
+; CHECK-NEXT:   br label %bb1
+; CHECK: bb1:
+; CHECK-NEXT:   %x_addr.0 = phi i32 [ %2, %bb ], [ %x, %entry ]
+; CHECK-NEXT:   %3 = tail call i8* @strchr(i8* %Q, i32 97)
+; CHECK-NEXT:   %4 = add i32 %x_addr.0, %0
+; CHECK-NEXT:   %5 = getelementptr i8, i8* %3, i32 %x_addr.0
+; CHECK-NEXT:   ret i8* %5
+; CHECK: }
+
 declare i32 @strlen(i8*) nounwind readonly
 
 declare i8* @strchr(i8*, i32) nounwind readonly

diff --git a/test/Transforms/GVN/load-constant-mem.ll b/test/Transforms/GVN/load-constant-mem.ll
index f870485630fa03285f9425415fc62b31814ad86b..a61c83d33047aad9e5eec6888fdc0800117c1505 100644 (file)
--- a/test/Transforms/GVN/load-constant-mem.ll
+++ b/test/Transforms/GVN/load-constant-mem.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -instcombine -S | grep "ret i32 0"
+; RUN: opt < %s -basicaa -gvn -instcombine -S | FileCheck %s
 ; PR4189
 @G = external constant [4 x i32]
 
@@ -11,3 +11,9 @@ entry:
        %C = sub i32 %A, %B
        ret i32 %C
 }
+
+; CHECK: define i32 @test(i8* %p, i32 %i) #0 {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   store i8 4, i8* %p, align 1
+; CHECK-NEXT:   ret i32 0
+; CHECK-NEXT: }

diff --git a/test/Transforms/GVN/local-pre.ll b/test/Transforms/GVN/local-pre.ll
index 2c92699dca91dfa9bf7d1c3e7f27262a3c2d7c31..943f351f17a9723b571195a0be454ac375de234a 100644 (file)
--- a/test/Transforms/GVN/local-pre.ll
+++ b/test/Transforms/GVN/local-pre.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -gvn -enable-pre -S | grep "b.pre"
+; RUN: opt < %s -gvn -enable-pre -S | FileCheck %s
 
 define i32 @main(i32 %p, i32 %q) {
 block1:
@@ -11,8 +11,12 @@ block2:
 
 block3:
   br label %block4
+; CHECK: %.pre = add i32 %p, 1
+; CHECK-NEXT: br label %block4
 
 block4:
   %b = add i32 %p, 1
   ret i32 %b
+; CHECK: %b.pre-phi = phi i32 [ %.pre, %block3 ], [ %a, %block2 ]
+; CHECK-NEXT: ret i32 %b.pre-phi
 }

diff --git a/test/Transforms/GVN/nonescaping-malloc.ll b/test/Transforms/GVN/nonescaping-malloc.ll
index f83b317fade40a70c533621d180155f5607b0d53..250e27c88f4525503e57e538b4bffb3753b6dda0 100644 (file)
--- a/test/Transforms/GVN/nonescaping-malloc.ll
+++ b/test/Transforms/GVN/nonescaping-malloc.ll
@@ -1,7 +1,9 @@
 ; REQUIRES: asserts
-; RUN: opt < %s -basicaa -gvn -stats -disable-output 2>&1 | grep "Number of loads deleted"
+; RUN: opt < %s -basicaa -gvn -stats -disable-output 2>&1 | FileCheck %s
 ; rdar://7363102
 
+; CHECK: Number of loads deleted
+
 ; GVN should be able to eliminate load %tmp22.i, because it is redundant with
 ; load %tmp8.i. This requires being able to prove that %tmp7.i doesn't
 ; alias the malloc'd value %tmp.i20.i.i, which it can do since %tmp7.i

diff --git a/test/Transforms/GVN/pre-basic-add.ll b/test/Transforms/GVN/pre-basic-add.ll
index fa4e2e3abded05ebac9f17e60485844a9ff33d3a..f4000c56c3588f9838a995173272a99089267799 100644 (file)
--- a/test/Transforms/GVN/pre-basic-add.ll
+++ b/test/Transforms/GVN/pre-basic-add.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -gvn -enable-pre -S | grep ".pre"
+; RUN: opt < %s -gvn -enable-pre -S | FileCheck %s
 
 @H = common global i32 0               ; <i32*> [#uses=2]
 @G = common global i32 0               ; <i32*> [#uses=1]
@@ -12,6 +12,7 @@ entry:
 
 bb:            ; preds = %entry
        %3 = add i32 %0, 42             ; <i32> [#uses=1]
+; CHECK: %.pre = add i32 %0, 42
        store i32 %3, i32* @G, align 4
        br label %bb1
 
@@ -20,6 +21,10 @@ bb1:         ; preds = %bb, %entry
        store i32 %4, i32* @H, align 4
        br label %return
 
+; CHECK: %.pre-phi = phi i32 [ %.pre, %entry.bb1_crit_edge ], [ %3, %bb ]
+; CHECK-NEXT: store i32 %.pre-phi, i32* @H, align 4
+; CHECK-NEXT: ret i32 0
+
 return:                ; preds = %bb1
        ret i32 0
 }

diff --git a/test/Transforms/GVN/rle-must-alias.ll b/test/Transforms/GVN/rle-must-alias.ll
index bf8b139a2e8611232611b01ec8645af291d71725..e5fafd9d6b311192bfac780ec850c19d7916250b 100644 (file)
--- a/test/Transforms/GVN/rle-must-alias.ll
+++ b/test/Transforms/GVN/rle-must-alias.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -S | grep "DEAD = phi i32 "
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 
 ; GVN should eliminate the fully redundant %9 GEP which 
 ; allows DEAD to be removed.  This is PR3198.
@@ -33,6 +33,7 @@ bb1:          ; preds = %entry
 bb3:           ; preds = %bb1, %bb
        %9 = getelementptr [100 x i32], [100 x i32]* @H, i32 0, i32 %i          ; <i32*> [#uses=1]
        %DEAD = load i32, i32* %9, align 4              ; <i32> [#uses=1]
+; CHECK: %DEAD = phi i32 [ 0, %bb1 ], [ %4, %bb ]
        ret i32 %DEAD
 
 bb4:           ; preds = %bb1

diff --git a/test/Transforms/GVN/rle-semidominated.ll b/test/Transforms/GVN/rle-semidominated.ll
index f80d040c93ebe1c05bd19da23f8b562cc18ab88d..f9704d3efbffa7937fad1da9554e0c4c02f0cfdd 100644 (file)
--- a/test/Transforms/GVN/rle-semidominated.ll
+++ b/test/Transforms/GVN/rle-semidominated.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -gvn -S | grep "DEAD = phi i32 "
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 
 define i32 @main(i32* %p, i32 %x, i32 %y) {
 block1:
@@ -18,3 +18,19 @@ block4:
   %DEAD = load i32, i32* %p
   ret i32 %DEAD
 }
+
+; CHECK: define i32 @main(i32* %p, i32 %x, i32 %y) {
+; CHECK-NEXT: block1:
+; CHECK-NOT:    %z = load i32, i32* %p
+; CHECK-NEXT:   %cmp = icmp eq i32 %x, %y
+; CHECK-NEXT:   br i1 %cmp, label %block2, label %block3
+; CHECK: block2:
+; CHECK-NEXT:   %DEAD.pre = load i32, i32* %p
+; CHECK-NEXT:   br label %block4
+; CHECK: block3:
+; CHECK-NEXT:   store i32 0, i32* %p
+; CHECK-NEXT:   br label %block4
+; CHECK: block4:
+; CHECK-NEXT:   %DEAD = phi i32 [ 0, %block3 ], [ %DEAD.pre, %block2 ]
+; CHECK-NEXT:   ret i32 %DEAD
+; CHECK-NEXT: }