From bd8056ef326e075cc500f3f0cfcd1193bc200594 Mon Sep 17 00:00:00 2001
From: Chen Zheng <czhengsz@cn.ibm.com>
Date: Sat, 13 Apr 2019 07:34:55 +0000
Subject: [PATCH] [InstCombine] [NFC] add testcases for canonicalizing (-X srem
 Y) to -(X srem Y).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358327 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/InstCombine/srem-canonicalize.ll | 63 ++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 test/Transforms/InstCombine/srem-canonicalize.ll

diff --git a/test/Transforms/InstCombine/srem-canonicalize.ll b/test/Transforms/InstCombine/srem-canonicalize.ll
new file mode 100644
index 00000000000..af27fd3affa
--- /dev/null
+++ b/test/Transforms/InstCombine/srem-canonicalize.ll
@@ -0,0 +1,63 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i32 @test_srem_canonicalize_op0(i32 %x, i32 %y) {
+; CHECK-LABEL: @test_srem_canonicalize_op0(
+; CHECK-NEXT:    [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[SREM:%.*]] = srem i32 [[NEG]], [[Y:%.*]]
+; CHECK-NEXT:    ret i32 [[SREM]]
+;
+  %neg = sub nsw i32 0, %x
+  %srem = srem i32 %neg, %y
+  ret i32 %srem
+}
+
+; (X srem -Y) is not equal to -(X srem Y), don't canonicalize.
+define i32 @test_srem_canonicalize_op1(i32 %x, i32 %z) {
+; CHECK-LABEL: @test_srem_canonicalize_op1(
+; CHECK-NEXT:    [[Y:%.*]] = mul i32 [[Z:%.*]], 3
+; CHECK-NEXT:    [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[SREM:%.*]] = srem i32 [[Y]], [[NEG]]
+; CHECK-NEXT:    ret i32 [[SREM]]
+;
+  %y = mul i32 %z, 3
+  %neg = sub nsw i32 0, %x
+  %srem = srem i32 %y, %neg
+  ret i32 %srem
+}
+
+define i32 @test_srem_canonicalize_nonsw(i32 %x, i32 %y) {
+; CHECK-LABEL: @test_srem_canonicalize_nonsw(
+; CHECK-NEXT:    [[NEG:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[SREM:%.*]] = srem i32 [[NEG]], [[Y:%.*]]
+; CHECK-NEXT:    ret i32 [[SREM]]
+;
+  %neg = sub i32 0, %x
+  %srem = srem i32 %neg, %y
+  ret i32 %srem
+}
+
+define <2 x i32> @test_srem_canonicalize_vec(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @test_srem_canonicalize_vec(
+; CHECK-NEXT:    [[NEG:%.*]] = sub nsw <2 x i32> zeroinitializer, [[X:%.*]]
+; CHECK-NEXT:    [[SREM:%.*]] = srem <2 x i32> [[NEG]], [[Y:%.*]]
+; CHECK-NEXT:    ret <2 x i32> [[SREM]]
+;
+  %neg = sub nsw <2 x i32> <i32 0, i32 0>, %x
+  %srem = srem <2 x i32> %neg, %y
+  ret <2 x i32> %srem
+}
+
+define i32 @test_srem_canonicalize_multiple_uses(i32 %x, i32 %y) {
+; CHECK-LABEL: @test_srem_canonicalize_multiple_uses(
+; CHECK-NEXT:    [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[SREM:%.*]] = srem i32 [[NEG]], [[Y:%.*]]
+; CHECK-NEXT:    [[SREM2:%.*]] = srem i32 [[SREM]], [[NEG]]
+; CHECK-NEXT:    ret i32 [[SREM2]]
+;
+  %neg = sub nsw i32 0, %x
+  %srem = srem i32 %neg, %y
+  %srem2 = srem i32 %srem, %neg
+  ret i32 %srem2
+}
+
-- 
2.11.0