[llvm] 155e3aa - [InstCombine] Add tests for reassosiating `(add/sub (sub/add) (sub/add))`; NFC

Noah Goldstein via llvm-commits llvm-commits at lists.llvm.org
Tue Aug 27 11:43:26 PDT 2024


Author: Noah Goldstein
Date: 2024-08-27T11:43:17-07:00
New Revision: 155e3aa0d7ea46dc99672bfe7291ed3084201c5e

URL: https://github.com/llvm/llvm-project/commit/155e3aa0d7ea46dc99672bfe7291ed3084201c5e
DIFF: https://github.com/llvm/llvm-project/commit/155e3aa0d7ea46dc99672bfe7291ed3084201c5e.diff

LOG: [InstCombine] Add tests for reassosiating `(add/sub (sub/add) (sub/add))`; NFC

Added: 
    llvm/test/Transforms/InstCombine/fold-add-sub.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/InstCombine/fold-add-sub.ll b/llvm/test/Transforms/InstCombine/fold-add-sub.ll
new file mode 100644
index 00000000000000..107572459eb613
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/fold-add-sub.ll
@@ -0,0 +1,207 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes=instcombine -S | FileCheck %s
+
+declare void @use.i8(i8)
+define i8 @test_add_nsw(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_add_nsw(
+; CHECK-NEXT:    [[LHS:%.*]] = add nsw i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = add nsw i8 [[X]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = sub nsw i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = add nsw i8 %x, %y
+  %rhs = add nsw i8 %x, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = sub nsw i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_add_nsw_no_prop(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_add_nsw_no_prop(
+; CHECK-NEXT:    [[LHS:%.*]] = add nsw i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = add nuw i8 [[X]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = sub nsw i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = add nsw i8 %x, %y
+  %rhs = add nuw i8 %x, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = sub nsw i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_add(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_add(
+; CHECK-NEXT:    [[LHS:%.*]] = add i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = add i8 [[X]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = add i8 %x, %y
+  %rhs = add i8 %x, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = sub i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_add_fail(i8 %w, i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_add_fail(
+; CHECK-NEXT:    [[LHS:%.*]] = add i8 [[W:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = add i8 [[X:%.*]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = add i8 %w, %y
+  %rhs = add i8 %x, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = sub i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_add_nuw(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_add_nuw(
+; CHECK-NEXT:    [[LHS:%.*]] = add i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = or disjoint i8 [[X]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = sub nuw i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = add i8 %x, %y
+  %rhs = or disjoint i8 %x, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = sub nuw i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_add_nuw_no_prop(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_add_nuw_no_prop(
+; CHECK-NEXT:    [[LHS:%.*]] = add i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = or disjoint i8 [[X]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = sub i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = add i8 %x, %y
+  %rhs = or disjoint i8 %x, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = sub i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_sub_nuw(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_sub_nuw(
+; CHECK-NEXT:    [[LHS:%.*]] = sub nuw i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = sub nuw i8 [[Y]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = sub nuw i8 %x, %y
+  %rhs = sub nuw i8 %y, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = add i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_sub_nuw_no_prop(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_sub_nuw_no_prop(
+; CHECK-NEXT:    [[LHS:%.*]] = sub nuw i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = sub i8 [[Y]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = add nuw i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = sub nuw i8 %x, %y
+  %rhs = sub i8 %y, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = add nuw i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_sub_nsw(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_sub_nsw(
+; CHECK-NEXT:    [[LHS:%.*]] = sub nsw i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = sub nsw i8 [[Y]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = or disjoint i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = sub nsw i8 %x, %y
+  %rhs = sub nsw i8 %y, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = or disjoint i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_sub_nsw_no_prop(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_sub_nsw_no_prop(
+; CHECK-NEXT:    [[LHS:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = sub nsw i8 [[Y]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = or disjoint i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = sub i8 %x, %y
+  %rhs = sub nsw i8 %y, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = or disjoint i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_sub_none(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_sub_none(
+; CHECK-NEXT:    [[LHS:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = sub i8 [[Y]], [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = sub i8 %x, %y
+  %rhs = sub i8 %y, %z
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = add i8 %lhs, %rhs
+  ret i8 %r
+}
+
+define i8 @test_sub_none_fail(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @test_sub_none_fail(
+; CHECK-NEXT:    [[LHS:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RHS:%.*]] = sub i8 [[Z:%.*]], [[Y]]
+; CHECK-NEXT:    call void @use.i8(i8 [[LHS]])
+; CHECK-NEXT:    call void @use.i8(i8 [[RHS]])
+; CHECK-NEXT:    [[R:%.*]] = add i8 [[LHS]], [[RHS]]
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %lhs = sub i8 %x, %y
+  %rhs = sub i8 %z, %y
+  call void @use.i8(i8 %lhs)
+  call void @use.i8(i8 %rhs)
+  %r = add i8 %lhs, %rhs
+  ret i8 %r
+}


        


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