fix PR5436 by making the 'simple' case of SRoA not promote out of range

array indexes.  The "complex" case of SRoA still handles them, and correctly.

This fixes a weirdness where we'd correctly avoid transforming A[0][42] if
the 42 was too large, but we'd only do it if it was one gep, not two separate
ones.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90007 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 34 insertions, 2 deletions

diff --git a/test/Transforms/ScalarRepl/badarray.ll b/test/Transforms/ScalarRepl/badarray.ll
index decdd4bc29..3ec3c01b28 100644
--- a/test/Transforms/ScalarRepl/badarray.ll
+++ b/test/Transforms/ScalarRepl/badarray.ll
@@ -1,10 +1,14 @@
 ; RUN: opt < %s -scalarrepl -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-f80:32:32-n8:16:32"
+target triple = "i386-pc-linux-gnu"
+
+
 ; PR3466
 ; Off end of array, don't transform.
 define i32 @test1() {
 ; CHECK: @test1
-; CHECK: %X = alloca
+; CHECK-NOT: = alloca
 	%X = alloca [4 x i32]
 	%Y = getelementptr [4 x i32]* %X, i64 0, i64 6		; <i32*> [#uses=2]
 	store i32 0, i32* %Y
@@ -17,9 +21,37 @@ define i32 @test1() {
 define i32 @test2() nounwind {
 entry:
 ; CHECK: @test2
-; CHECK: %yx2.i = alloca
+; CHECK-NOT: = alloca
         %yx2.i = alloca float, align 4          ; <float*> [#uses=1]            
         %yx26.i = bitcast float* %yx2.i to i64*         ; <i64*> [#uses=1]      
         %0 = load i64* %yx26.i, align 8         ; <i64> [#uses=0]               
         unreachable
 }
+
+%base = type { i32, [0 x i8] }
+%padded = type { %base, [1 x i32] }
+
+; PR5436
+define void @test3() {
+entry:
+; CHECK: @test3
+; CHECK-NOT: = alloca
+; CHECK: store i64
+  %var_1 = alloca %padded, align 8                ; <%padded*> [#uses=3]
+  %0 = getelementptr inbounds %padded* %var_1, i32 0, i32 0 ; <%base*> [#uses=2]
+  
+  %p2 = getelementptr inbounds %base* %0, i32 0, i32 1, i32 0 ; <i8*> [#uses=1]
+  store i8 72, i8* %p2, align 1
+  
+  ; 72 -> a[0].
+
+  %callret = call %padded *@test3f() ; <i32> [#uses=2]
+  %callretcast = bitcast %padded* %callret to i8*                     ; <i8*> [#uses=1]
+  %var_11 = bitcast %padded* %var_1 to i8*        ; <i8*> [#uses=1]
+  call void @llvm.memcpy.i32(i8* %callretcast, i8* %var_11, i32 8, i32 4)
+  ret void
+}
+
+declare void @llvm.memcpy.i32(i8* nocapture, i8* nocapture, i32, i32) nounwind
+
+declare %padded* @test3f()