From 02b53da6b65a4f39d9d8ea9412a5438532043e0d Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Sun, 29 Jul 2018 18:07:28 +0000
Subject: [PATCH] [InstCombine] add tests for another sub-not variant; NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338220 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/InstCombine/sub-not.ll | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/test/Transforms/InstCombine/sub-not.ll b/test/Transforms/InstCombine/sub-not.ll
index c4fbbe22f4e..9335fdafcc1 100644
--- a/test/Transforms/InstCombine/sub-not.ll
+++ b/test/Transforms/InstCombine/sub-not.ll
@@ -108,3 +108,38 @@ define <2 x i8> @sub_inc_vec(<2 x i8> %x, <2 x i8> %y) {
   ret <2 x i8> %r
 }
 
+define i8 @sub_dec(i8 %x, i8 %y) {
+; CHECK-LABEL: @sub_dec(
+; CHECK-NEXT:    [[S:%.*]] = add i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[S]], [[Y:%.*]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = add i8 %x, -1
+  %r = sub i8 %s, %y
+  ret i8 %r
+}
+
+define i8 @sub_dec_extra_use(i8 %x, i8 %y) {
+; CHECK-LABEL: @sub_dec_extra_use(
+; CHECK-NEXT:    [[S:%.*]] = add i8 [[X:%.*]], -1
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[S]], [[Y:%.*]]
+; CHECK-NEXT:    call void @use(i8 [[S]])
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %s = add i8 %x, -1
+  %r = sub i8 %s, %y
+  call void @use(i8 %s)
+  ret i8 %r
+}
+
+define <2 x i8> @sub_dec_vec(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @sub_dec_vec(
+; CHECK-NEXT:    [[S:%.*]] = add <2 x i8> [[X:%.*]], <i8 undef, i8 -1>
+; CHECK-NEXT:    [[R:%.*]] = sub <2 x i8> [[S]], [[Y:%.*]]
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %s = add <2 x i8> %x, <i8 undef, i8 -1>
+  %r = sub <2 x i8> %s, %y
+  ret <2 x i8> %r
+}
+
-- 
2.11.0