forked from OSchip/llvm-project
344 lines
8.3 KiB
LLVM
344 lines
8.3 KiB
LLVM
; This test makes sure that div instructions are properly eliminated.
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test1(i32 %A) {
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%B = sdiv i32 %A, 1 ; <i32> [#uses=1]
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ret i32 %B
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test2(i32 %A) {
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; => Shift
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%B = udiv i32 %A, 8 ; <i32> [#uses=1]
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ret i32 %B
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: lshr i32 %A, 3
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}
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define i32 @test3(i32 %A) {
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; => 0, don't need to keep traps
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%B = sdiv i32 0, %A ; <i32> [#uses=1]
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ret i32 %B
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: ret i32 0
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}
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define i32 @test4(i32 %A) {
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; 0-A
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%B = sdiv i32 %A, -1 ; <i32> [#uses=1]
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ret i32 %B
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: sub i32 0, %A
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}
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define i32 @test5(i32 %A) {
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%B = udiv i32 %A, -16 ; <i32> [#uses=1]
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%C = udiv i32 %B, -4 ; <i32> [#uses=1]
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ret i32 %C
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: ret i32 0
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}
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define i1 @test6(i32 %A) {
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%B = udiv i32 %A, 123 ; <i32> [#uses=1]
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; A < 123
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%C = icmp eq i32 %B, 0 ; <i1> [#uses=1]
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ret i1 %C
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: icmp ult i32 %A, 123
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}
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define i1 @test7(i32 %A) {
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%B = udiv i32 %A, 10 ; <i32> [#uses=1]
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; A >= 20 && A < 30
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%C = icmp eq i32 %B, 2 ; <i1> [#uses=1]
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ret i1 %C
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; CHECK-LABEL: @test7(
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; CHECK-NEXT: add i32 %A, -20
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; CHECK-NEXT: icmp ult i32
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}
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define i1 @test8(i8 %A) {
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%B = udiv i8 %A, 123 ; <i8> [#uses=1]
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; A >= 246
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%C = icmp eq i8 %B, 2 ; <i1> [#uses=1]
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ret i1 %C
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: icmp ugt i8 %A, -11
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}
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define i1 @test9(i8 %A) {
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%B = udiv i8 %A, 123 ; <i8> [#uses=1]
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; A < 246
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%C = icmp ne i8 %B, 2 ; <i1> [#uses=1]
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ret i1 %C
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: icmp ult i8 %A, -10
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}
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define i32 @test10(i32 %X, i1 %C) {
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%V = select i1 %C, i32 64, i32 8 ; <i32> [#uses=1]
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%R = udiv i32 %X, %V ; <i32> [#uses=1]
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ret i32 %R
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: select i1 %C, i32 6, i32 3
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; CHECK-NEXT: lshr i32 %X
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}
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define i32 @test11(i32 %X, i1 %C) {
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%A = select i1 %C, i32 1024, i32 32 ; <i32> [#uses=1]
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%B = udiv i32 %X, %A ; <i32> [#uses=1]
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ret i32 %B
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; CHECK-LABEL: @test11(
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; CHECK-NEXT: select i1 %C, i32 10, i32 5
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; CHECK-NEXT: lshr i32 %X
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}
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; PR2328
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define i32 @test12(i32 %x) nounwind {
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%tmp3 = udiv i32 %x, %x ; 1
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ret i32 %tmp3
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: ret i32 1
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}
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define i32 @test13(i32 %x) nounwind {
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%tmp3 = sdiv i32 %x, %x ; 1
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ret i32 %tmp3
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: ret i32 1
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}
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define i32 @test14(i8 %x) nounwind {
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%zext = zext i8 %x to i32
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%div = udiv i32 %zext, 257 ; 0
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ret i32 %div
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; CHECK-LABEL: @test14(
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; CHECK-NEXT: ret i32 0
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}
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; PR9814
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define i32 @test15(i32 %a, i32 %b) nounwind {
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%shl = shl i32 1, %b
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%div = lshr i32 %shl, 2
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%div2 = udiv i32 %a, %div
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ret i32 %div2
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; CHECK-LABEL: @test15(
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; CHECK-NEXT: add i32 %b, -2
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; CHECK-NEXT: lshr i32 %a,
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; CHECK-NEXT: ret i32
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}
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define <2 x i64> @test16(<2 x i64> %x) nounwind {
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%shr = lshr <2 x i64> %x, <i64 5, i64 5>
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%div = udiv <2 x i64> %shr, <i64 6, i64 6>
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ret <2 x i64> %div
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; CHECK-LABEL: @test16(
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; CHECK-NEXT: udiv <2 x i64> %x, <i64 192, i64 192>
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; CHECK-NEXT: ret <2 x i64>
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}
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define <2 x i64> @test17(<2 x i64> %x) nounwind {
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%neg = sub nsw <2 x i64> zeroinitializer, %x
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%div = sdiv <2 x i64> %neg, <i64 3, i64 4>
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ret <2 x i64> %div
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; CHECK-LABEL: @test17(
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; CHECK-NEXT: sdiv <2 x i64> %x, <i64 -3, i64 -4>
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; CHECK-NEXT: ret <2 x i64>
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}
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define <2 x i64> @test18(<2 x i64> %x) nounwind {
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%div = sdiv <2 x i64> %x, <i64 -1, i64 -1>
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ret <2 x i64> %div
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; CHECK-LABEL: @test18(
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; CHECK-NEXT: sub <2 x i64> zeroinitializer, %x
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; CHECK-NEXT: ret <2 x i64>
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}
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define i32 @test19(i32 %x) {
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%A = udiv i32 1, %x
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ret i32 %A
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; CHECK-LABEL: @test19(
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; CHECK-NEXT: icmp eq i32 %x, 1
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; CHECK-NEXT: zext i1 %{{.*}} to i32
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; CHECK-NEXT: ret i32
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}
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define i32 @test20(i32 %x) {
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%A = sdiv i32 1, %x
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ret i32 %A
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; CHECK-LABEL: @test20(
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; CHECK-NEXT: add i32 %x, 1
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; CHECK-NEXT: icmp ult i32 %{{.*}}, 3
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; CHECK-NEXT: select i1 %{{.*}}, i32 %x, i32 {{.*}}
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; CHECK-NEXT: ret i32
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}
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define i32 @test21(i32 %a) {
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%shl = shl nsw i32 %a, 2
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%div = sdiv i32 %shl, 12
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ret i32 %div
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; CHECK-LABEL: @test21(
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; CHECK-NEXT: %div = sdiv i32 %a, 3
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test22(i32 %a) {
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%mul = mul nsw i32 %a, 3
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%div = sdiv i32 %mul, 12
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ret i32 %div
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; CHECK-LABEL: @test22(
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; CHECK-NEXT: %div = sdiv i32 %a, 4
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test23(i32 %a) {
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%shl = shl nuw i32 %a, 2
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%div = udiv i32 %shl, 12
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ret i32 %div
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; CHECK-LABEL: @test23(
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; CHECK-NEXT: %div = udiv i32 %a, 3
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test24(i32 %a) {
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%mul = mul nuw i32 %a, 3
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%div = udiv i32 %mul, 12
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ret i32 %div
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; CHECK-LABEL: @test24(
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; CHECK-NEXT: %div = lshr i32 %a, 2
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test25(i32 %a) {
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%shl = shl nsw i32 %a, 2
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%div = sdiv i32 %shl, 2
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ret i32 %div
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; CHECK-LABEL: @test25(
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; CHECK-NEXT: %div = shl nsw i32 %a, 1
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test26(i32 %a) {
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%mul = mul nsw i32 %a, 12
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%div = sdiv i32 %mul, 3
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ret i32 %div
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; CHECK-LABEL: @test26(
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; CHECK-NEXT: %div = shl nsw i32 %a, 2
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test27(i32 %a) {
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%shl = shl nuw i32 %a, 2
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%div = udiv i32 %shl, 2
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ret i32 %div
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; CHECK-LABEL: @test27(
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; CHECK-NEXT: %div = shl nuw i32 %a, 1
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test28(i32 %a) {
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%mul = mul nuw i32 %a, 36
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%div = udiv i32 %mul, 3
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ret i32 %div
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; CHECK-LABEL: @test28(
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; CHECK-NEXT: %div = mul nuw i32 %a, 12
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; CHECK-NEXT: ret i32 %div
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}
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define i32 @test29(i32 %a) {
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%mul = shl nsw i32 %a, 31
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%div = sdiv i32 %mul, -2147483648
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ret i32 %div
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; CHECK-LABEL: @test29(
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; CHECK-NEXT: %[[and:.*]] = and i32 %a, 1
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; CHECK-NEXT: ret i32 %[[and]]
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}
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define i32 @test30(i32 %a) {
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%mul = shl nuw i32 %a, 31
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%div = udiv i32 %mul, -2147483648
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ret i32 %div
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; CHECK-LABEL: @test30(
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; CHECK-NEXT: ret i32 %a
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}
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define <2 x i32> @test31(<2 x i32> %x) {
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%shr = lshr <2 x i32> %x, <i32 31, i32 31>
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%div = udiv <2 x i32> %shr, <i32 2147483647, i32 2147483647>
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ret <2 x i32> %div
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; CHECK-LABEL: @test31(
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; CHECK-NEXT: ret <2 x i32> zeroinitializer
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}
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define i32 @test32(i32 %a, i32 %b) {
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%shl = shl i32 2, %b
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%div = lshr i32 %shl, 2
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%div2 = udiv i32 %a, %div
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ret i32 %div2
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; CHECK-LABEL: @test32(
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; CHECK-NEXT: %[[shl:.*]] = shl i32 2, %b
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; CHECK-NEXT: %[[shr:.*]] = lshr i32 %[[shl]], 2
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; CHECK-NEXT: %[[div:.*]] = udiv i32 %a, %[[shr]]
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; CHECK-NEXT: ret i32
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}
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define <2 x i64> @test33(<2 x i64> %x) nounwind {
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%shr = lshr exact <2 x i64> %x, <i64 5, i64 5>
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%div = udiv exact <2 x i64> %shr, <i64 6, i64 6>
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ret <2 x i64> %div
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; CHECK-LABEL: @test33(
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; CHECK-NEXT: udiv exact <2 x i64> %x, <i64 192, i64 192>
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; CHECK-NEXT: ret <2 x i64>
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}
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define <2 x i64> @test34(<2 x i64> %x) nounwind {
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%neg = sub nsw <2 x i64> zeroinitializer, %x
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%div = sdiv exact <2 x i64> %neg, <i64 3, i64 4>
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ret <2 x i64> %div
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; CHECK-LABEL: @test34(
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; CHECK-NEXT: sdiv exact <2 x i64> %x, <i64 -3, i64 -4>
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; CHECK-NEXT: ret <2 x i64>
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}
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define i32 @test35(i32 %A) {
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%and = and i32 %A, 2147483647
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%mul = sdiv exact i32 %and, 2147483647
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ret i32 %mul
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; CHECK-LABEL: @test35(
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; CHECK-NEXT: %[[and:.*]] = and i32 %A, 2147483647
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; CHECK-NEXT: %[[udiv:.*]] = udiv exact i32 %[[and]], 2147483647
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; CHECK-NEXT: ret i32 %[[udiv]]
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}
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define i32 @test36(i32 %A) {
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%and = and i32 %A, 2147483647
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%shl = shl nsw i32 1, %A
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%mul = sdiv exact i32 %and, %shl
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ret i32 %mul
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; CHECK-LABEL: @test36(
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; CHECK-NEXT: %[[and:.*]] = and i32 %A, 2147483647
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; CHECK-NEXT: %[[shr:.*]] = lshr exact i32 %[[and]], %A
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; CHECK-NEXT: ret i32 %[[shr]]
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}
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define i32 @test37(i32* %b) {
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entry:
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store i32 0, i32* %b, align 4
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%0 = load i32, i32* %b, align 4
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br i1 undef, label %lor.rhs, label %lor.end
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lor.rhs: ; preds = %entry
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%mul = mul nsw i32 undef, %0
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br label %lor.end
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lor.end: ; preds = %lor.rhs, %entry
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%t.0 = phi i32 [ %0, %entry ], [ %mul, %lor.rhs ]
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%div = sdiv i32 %t.0, 2
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ret i32 %div
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; CHECK-LABEL: @test37(
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; CHECK: ret i32 0
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}
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