92 lines
2.9 KiB
LLVM
92 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test_sdiv_canonicalize_op0(i32 %x, i32 %y) {
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; CHECK-LABEL: @test_sdiv_canonicalize_op0(
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; CHECK-NEXT: [[SDIV1:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]]
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; CHECK-NEXT: ret i32 [[SDIV]]
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;
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%neg = sub nsw i32 0, %x
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%sdiv = sdiv i32 %neg, %y
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ret i32 %sdiv
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}
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define i32 @test_sdiv_canonicalize_op0_exact(i32 %x, i32 %y) {
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; CHECK-LABEL: @test_sdiv_canonicalize_op0_exact(
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; CHECK-NEXT: [[SDIV1:%.*]] = sdiv exact i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]]
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; CHECK-NEXT: ret i32 [[SDIV]]
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;
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%neg = sub nsw i32 0, %x
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%sdiv = sdiv exact i32 %neg, %y
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ret i32 %sdiv
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}
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; (X/-Y) is not equal to -(X/Y), don't canonicalize.
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define i32 @test_sdiv_canonicalize_op1(i32 %x, i32 %z) {
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; CHECK-LABEL: @test_sdiv_canonicalize_op1(
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; CHECK-NEXT: [[Y:%.*]] = mul i32 [[Z:%.*]], 3
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; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
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; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[Y]], [[NEG]]
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; CHECK-NEXT: ret i32 [[SDIV]]
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;
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%y = mul i32 %z, 3
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%neg = sub nsw i32 0, %x
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%sdiv = sdiv i32 %y, %neg
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ret i32 %sdiv
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}
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define i32 @test_sdiv_canonicalize_nonsw(i32 %x, i32 %y) {
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; CHECK-LABEL: @test_sdiv_canonicalize_nonsw(
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; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
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; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]]
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; CHECK-NEXT: ret i32 [[SDIV]]
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;
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%neg = sub i32 0, %x
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%sdiv = sdiv i32 %neg, %y
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ret i32 %sdiv
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}
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define <2 x i32> @test_sdiv_canonicalize_vec(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: @test_sdiv_canonicalize_vec(
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; CHECK-NEXT: [[SDIV1:%.*]] = sdiv <2 x i32> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[SDIV:%.*]] = sub nsw <2 x i32> zeroinitializer, [[SDIV1]]
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; CHECK-NEXT: ret <2 x i32> [[SDIV]]
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;
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%neg = sub nsw <2 x i32> <i32 0, i32 0>, %x
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%sdiv = sdiv <2 x i32> %neg, %y
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ret <2 x i32> %sdiv
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}
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define i32 @test_sdiv_canonicalize_multiple_uses(i32 %x, i32 %y) {
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; CHECK-LABEL: @test_sdiv_canonicalize_multiple_uses(
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; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
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; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]]
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; CHECK-NEXT: [[SDIV2:%.*]] = sdiv i32 [[SDIV]], [[NEG]]
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; CHECK-NEXT: ret i32 [[SDIV2]]
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;
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%neg = sub nsw i32 0, %x
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%sdiv = sdiv i32 %neg, %y
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%sdiv2 = sdiv i32 %sdiv, %neg
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ret i32 %sdiv2
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}
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; There is combination: -(X/CE) -> (X/-CE).
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; If combines (X/-CE) to -(X/CE), make sure don't combine them endless.
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@X = global i32 5
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define i64 @test_sdiv_canonicalize_constexpr(i64 %L1) {
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; currently opt folds (sub nsw i64 0, constexpr) -> (sub i64, 0, constexpr).
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; sdiv canonicalize requires a nsw sub.
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; CHECK-LABEL: @test_sdiv_canonicalize_constexpr(
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; CHECK-NEXT: [[B4:%.*]] = sdiv i64 [[L1:%.*]], sub (i64 0, i64 ptrtoint (i32* @X to i64))
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; CHECK-NEXT: ret i64 [[B4]]
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;
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%v1 = ptrtoint i32* @X to i64
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%B8 = sub nsw i64 0, %v1
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%B4 = sdiv i64 %L1, %B8
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ret i64 %B4
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}
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