Teach instcombine to promote alloca array sizes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104945 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 3 deletions

diff --git a/test/Transforms/InstCombine/alloca.ll b/test/Transforms/InstCombine/alloca.ll
index b9add4d..e4d1367 100644
--- a/test/Transforms/InstCombine/alloca.ll
+++ b/test/Transforms/InstCombine/alloca.ll
@@ -1,12 +1,13 @@
-; Zero byte allocas should be deleted.
 target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
 
-; RUN: opt < %s -instcombine -S | \
-; RUN:   not grep alloca
+; RUN: opt < %s -instcombine -S | FileCheck %s
 ; END.
 
 declare void @use(...)
 
+; Zero byte allocas should be deleted.
+; CHECK: @test
+; CHECK-NOT: alloca
 define void @test() {
         %X = alloca [0 x i32]           ; <[0 x i32]*> [#uses=1]
         call void (...)* @use( [0 x i32]* %X )
@@ -17,12 +18,18 @@ define void @test() {
         ret void
 }
 
+; Zero byte allocas should be deleted.
+; CHECK: @test2
+; CHECK-NOT: alloca
 define void @test2() {
         %A = alloca i32         ; <i32*> [#uses=1]
         store i32 123, i32* %A
         ret void
 }
 
+; Zero byte allocas should be deleted.
+; CHECK: @test3
+; CHECK-NOT: alloca
 define void @test3() {
         %A = alloca { i32 }             ; <{ i32 }*> [#uses=1]
         %B = getelementptr { i32 }* %A, i32 0, i32 0            ; <i32*> [#uses=1]
@@ -30,3 +37,10 @@ define void @test3() {
         ret void
 }
 
+; CHECK: @test4
+; CHECK: = zext i32 %n to i64
+; CHECK: %A = alloca i32, i64 %
+define i32* @test4(i32 %n) {
+  %A = alloca i32, i32 %n
+  ret i32* %A
+}