From 6d282cdcdeaab85c19c25a7ddcb599eb337acd14 Mon Sep 17 00:00:00 2001
From: Chen Zheng <czhengsz@cn.ibm.com>
Date: Mon, 8 Apr 2019 09:19:42 +0000
Subject: [PATCH] [InstCombine] add more testcases for sdiv exact flag fixup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357894 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/InstCombine/div.ll | 74 +++++++++++++++++++++++++++---
 1 file changed, 68 insertions(+), 6 deletions(-)

diff --git a/test/Transforms/InstCombine/div.ll b/test/Transforms/InstCombine/div.ll
index 91747a55563..1bfa980d93c 100644
--- a/test/Transforms/InstCombine/div.ll
+++ b/test/Transforms/InstCombine/div.ll
@@ -760,10 +760,10 @@ define <2 x i8> @udiv_common_factor_not_nuw_vec(<2 x i8> %x, <2 x i8> %y, <2 x i
   ret <2 x i8> %c
 }
 
-define i32 @test_exact(i32 %x) {
-; CHECK-LABEL: @test_exact(
-; CHECK-NEXT:    [[DIV:%.*]] = sdiv i32 [[X:%.*]], -3
-; CHECK-NEXT:    ret i32 [[DIV]]
+define i32 @test_exact_nsw_exact(i32 %x) {
+; CHECK-LABEL: @test_exact_nsw_exact(
+; CHECK-NEXT:    [[NEG:%.*]] = sdiv i32 [[X:%.*]], -3
+; CHECK-NEXT:    ret i32 [[NEG]]
 ;
   %div = sdiv exact i32 %x, 3
   %neg = sub nsw i32 0, %div
@@ -772,10 +772,72 @@ define i32 @test_exact(i32 %x) {
 
 define <2 x i64> @test_exact_vec(<2 x i64> %x) {
 ; CHECK-LABEL: @test_exact_vec(
-; CHECK-NEXT:    [[DIV:%.*]] = sdiv <2 x i64> [[X:%.*]], <i64 -3, i64 -4>
-; CHECK-NEXT:    ret <2 x i64> [[DIV]]
+; CHECK-NEXT:    [[NEG:%.*]] = sdiv <2 x i64> [[X:%.*]], <i64 -3, i64 -4>
+; CHECK-NEXT:    ret <2 x i64> [[NEG]]
 ;
   %div = sdiv exact <2 x i64> %x, <i64 3, i64 4>
   %neg = sub nsw <2 x i64> zeroinitializer, %div
   ret <2 x i64> %neg
 }
+
+define i32 @test_exact_nonsw_exact(i32 %x) {
+; CHECK-LABEL: @test_exact_nonsw_exact(
+; CHECK-NEXT:    [[NEG:%.*]] = sdiv i32 [[X:%.*]], -3
+; CHECK-NEXT:    ret i32 [[NEG]]
+;
+  %div = sdiv exact i32 %x, 3
+  %neg = sub i32 0, %div
+  ret i32 %neg
+}
+
+define i32 @test_exact_nsw_noexact(i32 %x) {
+; CHECK-LABEL: @test_exact_nsw_noexact(
+; CHECK-NEXT:    [[NEG:%.*]] = sdiv i32 [[X:%.*]], -3
+; CHECK-NEXT:    ret i32 [[NEG]]
+;
+  %div = sdiv i32 %x, 3
+  %neg = sub nsw i32 0, %div
+  ret i32 %neg
+}
+
+define i32 @test_exact_nonsw_noexact(i32 %x) {
+; CHECK-LABEL: @test_exact_nonsw_noexact(
+; CHECK-NEXT:    [[NEG:%.*]] = sdiv i32 [[X:%.*]], -3
+; CHECK-NEXT:    ret i32 [[NEG]]
+;
+  %div = sdiv i32 %x, 3
+  %neg = sub nsw i32 0, %div
+  ret i32 %neg
+}
+
+define i32 @test_exact_div_nonconst(i32 %x, i32 %y) {
+; CHECK-LABEL: @test_exact_div_nonconst(
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = sub nsw i32 0, [[DIV]]
+; CHECK-NEXT:    ret i32 [[NEG]]
+;
+  %div = sdiv exact i32 %x, %y
+  %neg = sub nsw i32 0, %div
+  ret i32 %neg
+}
+
+define i32 @test_exact_div_one(i32 %x) {
+; CHECK-LABEL: @test_exact_div_one(
+; CHECK-NEXT:    [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
+; CHECK-NEXT:    ret i32 [[NEG]]
+;
+  %div = sdiv exact i32 %x, 1
+  %neg = sub nsw i32 0, %div
+  ret i32 %neg
+}
+
+define i8 @test_exact_div_minSigned(i8 %x) {
+; CHECK-LABEL: @test_exact_div_minSigned(
+; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i8 [[X:%.*]], -128
+; CHECK-NEXT:    [[NEG:%.*]] = sext i1 [[TMP1]] to i8
+; CHECK-NEXT:    ret i8 [[NEG]]
+;
+  %div = sdiv exact i8 %x, -128
+  %neg = sub nsw i8 0, %div
+  ret i8 %neg
+}
-- 
2.50.1