While converting one of the operands to a memory operand, we need to check if it is Legal and does not result into a cyclic dep.

llvm-svn: 91904

1 files changed, 15 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/PIC16/C16-49.ll b/llvm/test/CodeGen/PIC16/C16-49.ll
new file mode 100644
index 00000000000..e59800b9a92
--- /dev/null
+++ b/llvm/test/CodeGen/PIC16/C16-49.ll
@@ -0,0 +1,15 @@
+;RUN: llvm-as < %s | llc -march=pic16
+
+@aa = global i16 55, align 1                      ; <i16*> [#uses=1]
+@bb = global i16 44, align 1                      ; <i16*> [#uses=1]
+@PORTD = external global i8                       ; <i8*> [#uses=1]
+
+define void @foo() nounwind {
+entry:
+  %tmp = volatile load i16* @aa                   ; <i16> [#uses=1]
+  %tmp1 = volatile load i16* @bb                  ; <i16> [#uses=1]
+  %sub = sub i16 %tmp, %tmp1                      ; <i16> [#uses=1]
+  %conv = trunc i16 %sub to i8                    ; <i8> [#uses=1]
+  store i8 %conv, i8* @PORTD
+  ret void
+}