ARM: avoid handing a deleted node back to TableGen during ISel.
When we replaced the multiplicand the destination node might already exist.
When that happens the original gets CSEd and deleted. However, it's actually
used as the offset so nonsense is produced.
Should fix PR32726.
llvm-svn: 301983
diff --git a/llvm/test/CodeGen/ARM/load-arm.ll b/llvm/test/CodeGen/ARM/load-arm.ll
new file mode 100644
index 0000000..94ade49
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/load-arm.ll
@@ -0,0 +1,17 @@
+; RUN: llc -mtriple=arm %s -o - | FileCheck %s
+; RUN: llc -mtriple=thumbv7 %s -o - | FileCheck %s
+
+; We ended up feeding a deleted node back to TableGen when we converted "Off *
+; 410" into "(Off * 205) << 1", where the multiplication already existed in the
+; DAG.
+
+; CHECK-LABEL: addrmode_cse_mutation:
+; CHECK: {{mul|muls}} [[OFFSET:r[0-9]+]], {{r[0-9]+}}, {{r[0-9]+}}
+; CHECK: {{ldrb|ldrb.w}} {{r[0-9]+}}, [r0, [[OFFSET]], lsl #3]
+define i32 @addrmode_cse_mutation(i8* %base, i32 %count) {
+ %offset = mul i32 %count, 277288
+ %ptr = getelementptr i8, i8* %base, i32 %offset
+ %val = load volatile i8, i8* %ptr
+ %res = mul i32 %count, 34661
+ ret i32 %res
+}