; This test makes sure that div instructions are properly eliminated.
-;
-; RUN: if as < %s | opt -instcombine | dis | grep div
-; RUN: then exit 1
-; RUN: else exit 0
-; RUN: fi
+; RUN: opt < %s -instcombine -S | FileCheck %s
-implementation
+define i32 @test1(i32 %A) {
+ %B = sdiv i32 %A, 1 ; <i32> [#uses=1]
+ ret i32 %B
+; CHECK-LABEL: @test1(
+; CHECK-NEXT: ret i32 %A
+}
-int "test1"(int %A)
-begin
- %B = div int %A, 1
- ret int %B
-end
+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 nsw 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 nsw 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
+}
+
+define <2 x i64> @test33(<2 x i64> %x) nounwind {
+ %shr = lshr exact <2 x i64> %x, <i64 5, i64 5>
+ %div = udiv exact <2 x i64> %shr, <i64 6, i64 6>
+ ret <2 x i64> %div
+; CHECK-LABEL: @test33(
+; CHECK-NEXT: udiv exact <2 x i64> %x, <i64 192, i64 192>
+; CHECK-NEXT: ret <2 x i64>
+}
+
+define <2 x i64> @test34(<2 x i64> %x) nounwind {
+ %neg = sub nsw <2 x i64> zeroinitializer, %x
+ %div = sdiv exact <2 x i64> %neg, <i64 3, i64 4>
+ ret <2 x i64> %div
+; CHECK-LABEL: @test34(
+; CHECK-NEXT: sdiv exact <2 x i64> %x, <i64 -3, i64 -4>
+; CHECK-NEXT: ret <2 x i64>
+}
+
+define i32 @test35(i32 %A) {
+ %and = and i32 %A, 2147483647
+ %mul = sdiv exact i32 %and, 2147483647
+ ret i32 %mul
+; CHECK-LABEL: @test35(
+; CHECK-NEXT: %[[and:.*]] = and i32 %A, 2147483647
+; CHECK-NEXT: %[[udiv:.*]] = udiv exact i32 %[[and]], 2147483647
+; CHECK-NEXT: ret i32 %[[udiv]]
+}
+
+define i32 @test36(i32 %A) {
+ %and = and i32 %A, 2147483647
+ %shl = shl nsw i32 1, %A
+ %mul = sdiv exact i32 %and, %shl
+ ret i32 %mul
+; CHECK-LABEL: @test36(
+; CHECK-NEXT: %[[and:.*]] = and i32 %A, 2147483647
+; CHECK-NEXT: %[[shr:.*]] = lshr exact i32 %[[and]], %A
+; CHECK-NEXT: ret i32 %[[shr]]
+}
projects / oota-llvm.git / blobdiff