X86 address mode matching code MatchAddressRecursively does some aggressive hack which require doing a RAUW. It may end up deleting some SDNode up stream. It should avoid referencing deleted nodes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98780 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 39 insertions, 0 deletions

diff --git a/test/CodeGen/X86/2010-03-17-ISelBug.ll b/test/CodeGen/X86/2010-03-17-ISelBug.ll
new file mode 100644
index 0000000000..609b4e2490
--- /dev/null
+++ b/test/CodeGen/X86/2010-03-17-ISelBug.ll
@@ -0,0 +1,39 @@
+; RUN: llc < %s -mtriple=i386-apple-darwin5
+; rdar://7761790
+
+%"struct..0$_485" = type { i16, i16, i32 }
+%union.PPToken = type { %"struct..0$_485" }
+%struct.PPOperation = type { %union.PPToken, %union.PPToken, [6 x %union.PPToken], i32, i32, i32, [1 x i32], [0 x i8] }
+
+define i32* @t() align 2 nounwind {
+entry:
+  %operation = alloca %struct.PPOperation, align 8 ; <%struct.PPOperation*> [#uses=2]
+  %0 = load i32*** null, align 4  ; [#uses=1]
+  %1 = ptrtoint i32** %0 to i32   ; <i32> [#uses=1]
+  %2 = sub nsw i32 %1, undef                      ; <i32> [#uses=2]
+  br i1 false, label %bb20, label %bb.nph380
+
+bb20:                                             ; preds = %entry
+  ret i32* null
+
+bb.nph380:                                        ; preds = %entry
+  %scevgep403 = getelementptr %struct.PPOperation* %operation, i32 0, i32 1, i32 0, i32 2 ; <i32*> [#uses=1]
+  %3 = ashr i32 %2, 1                             ; <i32> [#uses=1]
+  %tmp405 = and i32 %3, -2                        ; <i32> [#uses=1]
+  %scevgep408 = getelementptr %struct.PPOperation* %operation, i32 0, i32 1, i32 0, i32 1 ; <i16*> [#uses=1]
+  %tmp410 = and i32 %2, -4                        ; <i32> [#uses=1]
+  br label %bb169
+
+bb169:                                            ; preds = %bb169, %bb.nph380
+  %index.6379 = phi i32 [ 0, %bb.nph380 ], [ %4, %bb169 ] ; <i32> [#uses=3]
+  %tmp404 = mul i32 %index.6379, -2               ; <i32> [#uses=1]
+  %tmp406 = add i32 %tmp405, %tmp404              ; <i32> [#uses=1]
+  %scevgep407 = getelementptr i32* %scevgep403, i32 %tmp406 ; <i32*> [#uses=1]
+  %tmp409 = mul i32 %index.6379, -4               ; <i32> [#uses=1]
+  %tmp411 = add i32 %tmp410, %tmp409              ; <i32> [#uses=1]
+  %scevgep412 = getelementptr i16* %scevgep408, i32 %tmp411 ; <i16*> [#uses=1]
+  store i16 undef, i16* %scevgep412, align 2
+  store i32 undef, i32* %scevgep407, align 4
+  %4 = add nsw i32 %index.6379, 1                 ; <i32> [#uses=1]
+  br label %bb169
+}