[llvm] 8ef0532 - [InstCombine] add tests for sub of smin/smax; NFC

[Sanjay Patel via llvm-commits]

Author: Sanjay Patel
Date: 2022-07-04T18:46:40-04:00
New Revision: 8ef053273abf2ae3ae05801808908af9dd7887c3

URL: https://github.com/llvm/llvm-project/commit/8ef053273abf2ae3ae05801808908af9dd7887c3
DIFF: https://github.com/llvm/llvm-project/commit/8ef053273abf2ae3ae05801808908af9dd7887c3.diff

LOG: [InstCombine] add tests for sub of smin/smax; NFC

issue #55470

Added: 
    

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

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/InstCombine/sub-minmax.ll b/llvm/test/Transforms/InstCombine/sub-minmax.ll
index fa762987c6b9..0191ebe9daec 100644
--- a/llvm/test/Transforms/InstCombine/sub-minmax.ll
+++ b/llvm/test/Transforms/InstCombine/sub-minmax.ll
@@ -2,6 +2,8 @@
 ; RUN: opt < %s -passes=instcombine -S | FileCheck %s
 
 declare i5 @llvm.umin.i5(i5, i5)
+declare <2 x i8> @llvm.smin.v2i8(<2 x i8>, <2 x i8>)
+declare <2 x i8> @llvm.smax.v2i8(<2 x i8>, <2 x i8>)
 declare <2 x i8> @llvm.umin.v2i8(<2 x i8>, <2 x i8>)
 declare <2 x i8> @llvm.umax.v2i8(<2 x i8>, <2 x i8>)
 
@@ -877,5 +879,121 @@ define i8 @sub_add_umin_use_m(i8 %x, i8 %y, i8 %z) {
   ret i8 %s
 }
 
+define <2 x i8> @sub_smax0_sub_nsw(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smax0_sub_nsw
+; CHECK-SAME: (<2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw <2 x i8> [[X]], [[Y]]
+; CHECK-NEXT:    [[M:%.*]] = call <2 x i8> @llvm.smax.v2i8(<2 x i8> [[SUB]], <2 x i8> <i8 0, i8 poison>)
+; CHECK-NEXT:    [[R:%.*]] = sub <2 x i8> [[X]], [[M]]
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %sub = sub nsw <2 x i8> %x, %y
+  %m = call <2 x i8> @llvm.smax.v2i8(<2 x i8> %sub, <2 x i8> <i8 0, i8 poison>)
+  %r = sub <2 x i8> %x, %m
+  ret <2 x i8> %r
+}
+
+define i8 @sub_smax0_sub_nsw_use(i8 %x, i8 %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smax0_sub_nsw_use
+; CHECK-SAME: (i8 [[X:%.*]], i8 [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.smax.i8(i8 [[SUB]], i8 0)
+; CHECK-NEXT:    call void @use8(i8 [[M]])
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[X]], [[M]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %sub = sub nsw i8 %x, %y
+  %m = call i8 @llvm.smax.i8(i8 %sub, i8 0)
+  call void @use8(i8 %m)
+  %r = sub i8 %x, %m
+  ret i8 %r
+}
+
+define i8 @sub_smax0_sub(i8 %x, i8 %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smax0_sub
+; CHECK-SAME: (i8 [[X:%.*]], i8 [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.smax.i8(i8 [[SUB]], i8 0)
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[X]], [[M]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %sub = sub i8 %x, %y
+  %m = call i8 @llvm.smax.i8(i8 %sub, i8 0)
+  %r = sub i8 %x, %m
+  ret i8 %r
+}
+
+define i8 @sub_smax0_sub_commute(i8 %x, i8 %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smax0_sub_commute
+; CHECK-SAME: (i8 [[X:%.*]], i8 [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.smax.i8(i8 [[SUB]], i8 0)
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[M]], [[X]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %sub = sub i8 %x, %y
+  %m = call i8 @llvm.smax.i8(i8 %sub, i8 0)
+  %r = sub i8 %m, %x
+  ret i8 %r
+}
+
+define i8 @sub_smin0_sub_nsw_use(i8 %x, i8 %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smin0_sub_nsw_use
+; CHECK-SAME: (i8 [[X:%.*]], i8 [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i8 [[X]], [[Y]]
+; CHECK-NEXT:    call void @use8(i8 [[SUB]])
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.smin.i8(i8 [[SUB]], i8 0)
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[X]], [[M]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %sub = sub nsw i8 %x, %y
+  call void @use8(i8 %sub)
+  %m = call i8 @llvm.smin.i8(i8 %sub, i8 0)
+  %r = sub i8 %x, %m
+  ret i8 %r
+}
+
+define <2 x i8> @sub_smin0_sub_nsw(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smin0_sub_nsw
+; CHECK-SAME: (<2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw <2 x i8> [[X]], [[Y]]
+; CHECK-NEXT:    [[M:%.*]] = call <2 x i8> @llvm.smin.v2i8(<2 x i8> [[SUB]], <2 x i8> zeroinitializer)
+; CHECK-NEXT:    [[R:%.*]] = sub <2 x i8> [[X]], [[M]]
+; CHECK-NEXT:    ret <2 x i8> [[R]]
+;
+  %sub = sub nsw <2 x i8> %x, %y
+  %m = call <2 x i8> @llvm.smin.v2i8(<2 x i8> %sub, <2 x i8> zeroinitializer)
+  %r = sub <2 x i8> %x, %m
+  ret <2 x i8> %r
+}
+
+define i8 @sub_smin0_sub(i8 %x, i8 %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smin0_sub
+; CHECK-SAME: (i8 [[X:%.*]], i8 [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.smin.i8(i8 [[SUB]], i8 0)
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[X]], [[M]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %sub = sub i8 %x, %y
+  %m = call i8 @llvm.smin.i8(i8 %sub, i8 0)
+  %r = sub i8 %x, %m
+  ret i8 %r
+}
+
+define i8 @sub_smin0_sub_nsw_commute(i8 %x, i8 %y) {
+; CHECK-LABEL: define {{[^@]+}}@sub_smin0_sub_nsw_commute
+; CHECK-SAME: (i8 [[X:%.*]], i8 [[Y:%.*]]) {
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i8 [[Y]], [[X]]
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.smin.i8(i8 [[SUB]], i8 0)
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[X]], [[M]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %sub = sub nsw i8 %y, %x
+  %m = call i8 @llvm.smin.i8(i8 %sub, i8 0)
+  %r = sub i8 %x, %m
+  ret i8 %r
+}
+
 declare void @use8(i8)
 declare void @use32(i32 %u)