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