From: Chen Zheng <shchenz@cn.ibm.com>
Date: Fri, 20 Jul 2018 13:38:59 +0000 (+0000)
Subject: [NFC][testcases] fold sdiv if two operands are negated and non-overflow
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=60fb40346bfba8303bc15aed82b51dd8b972250c;p=llvm

[NFC][testcases] fold sdiv if two operands are negated and non-overflow


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337549 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/test/Transforms/InstSimplify/sdiv.ll b/test/Transforms/InstSimplify/sdiv.ll
index c39711dc340..be26f5712e7 100644
--- a/test/Transforms/InstSimplify/sdiv.ll
+++ b/test/Transforms/InstSimplify/sdiv.ll
@@ -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_vec(<2 x i32> %x, <2 x i32> %y) {
   %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
+}