[PATCH] D49365: [InstrSimplify] add testcases for fold sdiv if two operands are negatived and non-overflow
ChenZheng via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 16 08:11:48 PDT 2018
This revision was automatically updated to reflect the committed changes.
Closed by commit rL337179: [InstrSimplify] add testcases for fold sdiv if two operands are negatived and… (authored by shchenz, committed by ).
Changed prior to commit:
https://reviews.llvm.org/D49365?vs=155629&id=155686#toc
Repository:
rL LLVM
https://reviews.llvm.org/D49365
Files:
llvm/trunk/test/Transforms/InstCombine/sdiv.ll
Index: llvm/trunk/test/Transforms/InstCombine/sdiv.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/sdiv.ll
+++ llvm/trunk/test/Transforms/InstCombine/sdiv.ll
@@ -0,0 +1,49 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i32 @negated_operand(i32 %x) {
+; CHECK-LABEL: @negated_operand(
+; CHECK-NEXT: [[NEGX:%.*]] = sub nsw i32 0, [[X:%.*]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[NEGX]], [[X]]
+; CHECK-NEXT: ret i32 [[DIV]]
+;
+ %negx = sub nsw i32 0, %x
+ %div = sdiv i32 %negx, %x
+ ret i32 %div
+}
+
+define <2 x i32> @negated_operand_commute_vec(<2 x i32> %x) {
+; CHECK-LABEL: @negated_operand_commute_vec(
+; CHECK-NEXT: [[NEGX:%.*]] = sub nsw <2 x i32> zeroinitializer, [[X:%.*]]
+; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[NEGX]], [[X]]
+; CHECK-NEXT: ret <2 x i32> [[DIV]]
+;
+ %negx = sub nsw <2 x i32> zeroinitializer, %x
+ %div = sdiv <2 x i32> %negx, %x
+ ret <2 x i32> %div
+}
+
+define i32 @knownnegation(i32 %x, i32 %y) {
+; CHECK-LABEL: @knownnegation(
+; CHECK-NEXT: [[XY:%.*]] = sub nsw 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 nsw i32 %x, %y
+ %yx = sub nsw i32 %y, %x
+ %div = sdiv i32 %xy, %yx
+ ret i32 %div
+}
+
+define <2 x i32> @knownnegation_commute_vec(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @knownnegation_commute_vec(
+; CHECK-NEXT: [[XY:%.*]] = sub nsw <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 nsw <2 x i32> %x, %y
+ %yx = sub nsw <2 x i32> %y, %x
+ %div = sdiv <2 x i32> %xy, %yx
+ ret <2 x i32> %div
+}
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