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[InstrSimplify] add testcases for fold sdiv if two operands are negat…
…ived and non-overflow Differential Revision: https://reviews.llvm.org/D49365 llvm-svn: 337179
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Chen Zheng
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Jul 16, 2018
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; RUN: opt < %s -instcombine -S | FileCheck %s | ||
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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 | ||
} | ||
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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 | ||
} | ||
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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 | ||
} | ||
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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 | ||
} |