[MSP430] Fix PR32769: Select8 and Select16 need to have SR in Uses.
If Select pseudo instruction doesn't have use SR, then
CMP instructions are being marked as dead and later can be
removed by MachineCSE pass. This leads to incorrect code
generation.
Differential Revision: https://reviews.llvm.org/D32473
llvm-svn: 301372
diff --git a/llvm/test/CodeGen/MSP430/select-use-sr.ll b/llvm/test/CodeGen/MSP430/select-use-sr.ll
new file mode 100644
index 0000000..3f67fb8
--- /dev/null
+++ b/llvm/test/CodeGen/MSP430/select-use-sr.ll
@@ -0,0 +1,21 @@
+; RUN: llc < %s -march=msp430 | FileCheck %s
+; PR32769
+
+target triple = "msp430"
+
+; Test that CMP instruction is not removed by MachineCSE.
+;
+; CHECK-LABEL: @f
+; CHECK: cmp.w r15, r13
+; CHECK: cmp.w r15, r13
+; CHECK-NEXT: jeq .LBB0_2
+define i16 @f(i16, i16, i16, i16) {
+entry:
+ %4 = icmp ult i16 %1, %3
+ %5 = zext i1 %4 to i16
+ %6 = icmp ult i16 %0, %2
+ %7 = zext i1 %6 to i16
+ %8 = icmp eq i16 %1, %3
+ %out = select i1 %8, i16 %5, i16 %7
+ ret i16 %out
+}