; This test makes sure that div instructions are properly eliminated.
-;
-; RUN: as < %s | opt -instcombine | dis | grep-not div
+; 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
+}
+
+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 3, i64 5>
+ %div = udiv <2 x i64> %shr, <i64 4, i64 6>
+ ret <2 x i64> %div
+; CHECK-LABEL: @test16(
+; CHECK-NEXT: udiv <2 x i64> %x, <i64 32, 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
+}
-int %test1(int %A) {
- %B = div int %A, 1
- ret int %B
+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
}
-uint %test2(uint %A) {
- %B = div uint %A, 8 ; => Shift
- ret int %B
+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
}
-int %test3(int %A) {
- %B = div int 0, %A ; => 0, don't need to keep traps
- ret int %B
+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
}
projects / oota-llvm.git / blobdiff