[Mem2Reg] Respect optnone

Mem2Reg shouldn't be optimizing a function that is marked
optnone. There is a test checking this that fails when mem2reg is
explicitly added to the standard pass pipeline.

llvm-svn: 255336

1 files changed, 21 insertions, 0 deletions

diff --git a/llvm/test/Transforms/Mem2Reg/optnone.ll b/llvm/test/Transforms/Mem2Reg/optnone.ll
new file mode 100644
index 00000000000..41ee77aff79
--- /dev/null
+++ b/llvm/test/Transforms/Mem2Reg/optnone.ll
@@ -0,0 +1,21 @@
+; RUN: opt < %s -mem2reg -S | FileCheck %s
+
+; This function is optnone, so the allocas should not be eliminated.
+
+; CHECK-LABEL: @testfunc
+; CHECK: alloca
+; CHECK: alloca
+define double @testfunc(i32 %i, double %j) optnone noinline {
+	%I = alloca i32		; <i32*> [#uses=4]
+	%J = alloca double		; <double*> [#uses=2]
+	store i32 %i, i32* %I
+	store double %j, double* %J
+	%t1 = load i32, i32* %I		; <i32> [#uses=1]
+	%t2 = add i32 %t1, 1		; <i32> [#uses=1]
+	store i32 %t2, i32* %I
+	%t3 = load i32, i32* %I		; <i32> [#uses=1]
+	%t4 = sitofp i32 %t3 to double		; <double> [#uses=1]
+	%t5 = load double, double* %J		; <double> [#uses=1]
+	%t6 = fmul double %t4, %t5		; <double> [#uses=1]
+	ret double %t6
+}