[llvm] r337549 - [NFC][testcases] fold sdiv if two operands are negated and non-overflow
Chen Zheng via llvm-commits
llvm-commits at lists.llvm.org
Fri Jul 20 06:38:59 PDT 2018
Author: shchenz
Date: Fri Jul 20 06:38:59 2018
New Revision: 337549
URL: http://llvm.org/viewvc/llvm-project?rev=337549&view=rev
Log:
[NFC][testcases] fold sdiv if two operands are negated and non-overflow
Modified:
llvm/trunk/test/Transforms/InstSimplify/sdiv.ll
Modified: llvm/trunk/test/Transforms/InstSimplify/sdiv.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstSimplify/sdiv.ll?rev=337549&r1=337548&r2=337549&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstSimplify/sdiv.ll (original)
+++ llvm/trunk/test/Transforms/InstSimplify/sdiv.ll Fri Jul 20 06:38:59 2018
@@ -1,3 +1,4 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
define i32 @negated_operand(i32 %x) {
@@ -47,3 +48,149 @@ define <2 x i32> @knownnegation_commute_
%div = sdiv <2 x i32> %xy, %yx
ret <2 x i32> %div
}
+
+define i32 @negated_operand_2(i32 %t) {
+; CHECK-LABEL: @negated_operand_2(
+; CHECK-NEXT: [[X:%.*]] = sub i32 [[T:%.*]], 5
+; CHECK-NEXT: [[NEGX:%.*]] = sub nsw i32 0, [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[NEGX]], [[X]]
+; CHECK-NEXT: ret i32 [[DIV]]
+;
+ %x = sub i32 %t, 5
+ %negx = sub nsw i32 0, %x
+ %div = sdiv i32 %negx, %x
+ ret i32 %div
+}
+
+define i32 @negated_operand_commute(i32 %x) {
+; CHECK-LABEL: @negated_operand_commute(
+; CHECK-NEXT: [[NEGX:%.*]] = sub nsw i32 0, [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[X]], [[NEGX]]
+; CHECK-NEXT: ret i32 [[DIV]]
+;
+ %negx = sub nsw i32 0, %x
+ %div = sdiv i32 %x, %negx
+ ret i32 %div
+}
+
+define i32 @negated_operand_bad(i32 %x) {
+; CHECK-LABEL: @negated_operand_bad(
+; CHECK-NEXT: [[NEGX:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[NEGX]], [[X]]
+; CHECK-NEXT: ret i32 [[DIV]]
+;
+ %negx = sub i32 0, %x ; not nsw
+ %div = sdiv i32 %negx, %x
+ ret i32 %div
+}
+
+define i32 @knownnegation_bad_1(i32 %x, i32 %y) {
+; CHECK-LABEL: @knownnegation_bad_1(
+; CHECK-NEXT: [[XY:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[YX:%.*]] = sub i32 [[Y]], [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[XY]], [[YX]]
+; CHECK-NEXT: ret i32 [[DIV]]
+;
+ %xy = sub nsw i32 %x, %y
+ %yx = sub i32 %y, %x ; not nsw
+ %div = sdiv i32 %xy, %yx
+ ret i32 %div
+}
+
+define i32 @knownnegation_bad_2(i32 %x, i32 %y) {
+; CHECK-LABEL: @knownnegation_bad_2(
+; CHECK-NEXT: [[XY:%.*]] = sub i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[YX:%.*]] = sub nsw i32 [[Y]], [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[XY]], [[YX]]
+; CHECK-NEXT: ret i32 [[DIV]]
+;
+ %xy = sub i32 %x, %y ; not nsw
+ %yx = sub nsw i32 %y, %x
+ %div = sdiv i32 %xy, %yx
+ ret i32 %div
+}
+
+define i32 @knownnegation_bad_3(i32 %x, i32 %y) {
+; CHECK-LABEL: @knownnegation_bad_3(
+; CHECK-NEXT: [[XY:%.*]] = sub i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[YX:%.*]] = sub i32 [[Y]], [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[XY]], [[YX]]
+; CHECK-NEXT: ret i32 [[DIV]]
+;
+ %xy = sub i32 %x, %y ; not nsw
+ %yx = sub i32 %y, %x ; not nsw
+ %div = sdiv i32 %xy, %yx
+ ret i32 %div
+}
+
+define <2 x i32> @negated_operand_commute_vec_bad(<2 x i32> %x) {
+; CHECK-LABEL: @negated_operand_commute_vec_bad(
+; CHECK-NEXT: [[NEGX:%.*]] = sub <2 x i32> zeroinitializer, [[X:%.*]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[NEGX]], [[X]]
+; CHECK-NEXT: ret <2 x i32> [[DIV]]
+;
+ %negx = sub <2 x i32> zeroinitializer, %x ; not nsw
+ %div = sdiv <2 x i32> %negx, %x
+ ret <2 x i32> %div
+}
+
+define <2 x i32> @knownnegation_commute_vec_bad1(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @knownnegation_commute_vec_bad1(
+; CHECK-NEXT: [[XY:%.*]] = sub nsw <2 x i32> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[YX:%.*]] = sub <2 x i32> [[Y]], [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[XY]], [[YX]]
+; CHECK-NEXT: ret <2 x i32> [[DIV]]
+;
+ %xy = sub nsw <2 x i32> %x, %y
+ %yx = sub <2 x i32> %y, %x ; not nsw
+ %div = sdiv <2 x i32> %xy, %yx
+ ret <2 x i32> %div
+}
+
+define <2 x i32> @knownnegation_commute_vec_bad2(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @knownnegation_commute_vec_bad2(
+; CHECK-NEXT: [[XY:%.*]] = sub <2 x i32> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[YX:%.*]] = sub nsw <2 x i32> [[Y]], [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[XY]], [[YX]]
+; CHECK-NEXT: ret <2 x i32> [[DIV]]
+;
+ %xy = sub <2 x i32> %x, %y ; not nsw
+ %yx = sub nsw <2 x i32> %y, %x
+ %div = sdiv <2 x i32> %xy, %yx
+ ret <2 x i32> %div
+}
+
+define <2 x i32> @knownnegation_commute_vec_bad3(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @knownnegation_commute_vec_bad3(
+; CHECK-NEXT: [[XY:%.*]] = sub <2 x i32> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[YX:%.*]] = sub <2 x i32> [[Y]], [[X]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[XY]], [[YX]]
+; CHECK-NEXT: ret <2 x i32> [[DIV]]
+;
+ %xy = sub <2 x i32> %x, %y ; not nsw
+ %yx = sub <2 x i32> %y, %x ; not nsw
+ %div = sdiv <2 x i32> %xy, %yx
+ ret <2 x i32> %div
+}
+
+define <3 x i32> @negated_operand_vec_undef(<3 x i32> %x) {
+; CHECK-LABEL: @negated_operand_vec_undef(
+; CHECK-NEXT: [[NEGX:%.*]] = sub nsw <3 x i32> <i32 0, i32 undef, i32 0>, [[X:%.*]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv <3 x i32> [[NEGX]], [[X]]
+; CHECK-NEXT: ret <3 x i32> [[DIV]]
+;
+ %negx = sub nsw <3 x i32> <i32 0, i32 undef, i32 0>, %x
+ %div = sdiv <3 x i32> %negx, %x
+ ret <3 x i32> %div
+}
+
+define <2 x i32> @negated_operand_vec_nonsplat(<2 x i32> %x) {
+; CHECK-LABEL: @negated_operand_vec_nonsplat(
+; CHECK-NEXT: [[NEGX:%.*]] = sub nsw <2 x i32> <i32 0, i32 1>, [[X:%.*]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[NEGX]], [[X]]
+; CHECK-NEXT: ret <2 x i32> [[DIV]]
+;
+ %negx = sub nsw <2 x i32> <i32 0, i32 1>, %x ; not 0, don't fold
+ %div = sdiv <2 x i32> %negx, %x
+ ret <2 x i32> %div
+}
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