[llvm] cbd8041 - [InstCombine] add tests for (X - Y) == 0; NFC

[Sanjay Patel via llvm-commits]

Author: Sanjay Patel
Date: 2021-10-10T11:13:46-04:00
New Revision: cbd8041b0bbec2c1bd3fab81d6bf566901ca63d1

URL: https://github.com/llvm/llvm-project/commit/cbd8041b0bbec2c1bd3fab81d6bf566901ca63d1
DIFF: https://github.com/llvm/llvm-project/commit/cbd8041b0bbec2c1bd3fab81d6bf566901ca63d1.diff

LOG: [InstCombine] add tests for (X - Y) == 0; NFC

Added: 
    

Modified: 
    llvm/test/Transforms/InstCombine/icmp-sub.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/InstCombine/icmp-sub.ll b/llvm/test/Transforms/InstCombine/icmp-sub.ll
index 03488a2f469a..17a6800a7a79 100644
--- a/llvm/test/Transforms/InstCombine/icmp-sub.ll
+++ b/llvm/test/Transforms/InstCombine/icmp-sub.ll
@@ -462,3 +462,29 @@ define i1 @neg_nsw_sgt_1(i8 %x) {
   %r = icmp sgt i8 %negx, 1
   ret i1 %r
 }
+
+define i1 @sub_eq_zero_use(i32 %x, i32 %y) {
+; CHECK-LABEL: @sub_eq_zero_use(
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    call void @use(i32 [[SUB]])
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i32 [[SUB]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %sub = sub i32 %x, %y
+  call void @use(i32 %sub)
+  %r = icmp eq i32 %sub, 0
+  ret i1 %r
+}
+
+define <2 x i1> @sub_ne_zero_use(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @sub_ne_zero_use(
+; CHECK-NEXT:    [[SUB:%.*]] = sub <2 x i8> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    call void @use_vec(<2 x i8> [[SUB]])
+; CHECK-NEXT:    [[R:%.*]] = icmp eq <2 x i8> [[SUB]], zeroinitializer
+; CHECK-NEXT:    ret <2 x i1> [[R]]
+;
+  %sub = sub <2 x i8> %x, %y
+  call void @use_vec(<2 x i8> %sub)
+  %r = icmp eq <2 x i8> %sub, zeroinitializer
+  ret <2 x i1> %r
+}