; This test makes sure that div instructions are properly eliminated.
-;
-; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep 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: @test1
+; CHECK-NEXT: ret i32 %A
+}
+
+define i32 @test2(i32 %A) {
+ ; => Shift
+ %B = udiv i32 %A, 8 ; <i32> [#uses=1]
+ ret i32 %B
+; CHECK: @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: @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: @test4
+; CHECK-NEXT: sub i32 0, %A
+}
-int %test1(int %A) {
- %B = div int %A, 1
- ret int %B
+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: @test5
+; CHECK-NEXT: ret i32 0
}
-uint %test2(uint %A) {
- %B = div uint %A, 8 ; => Shift
- ret uint %B
+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: @test6
+; CHECK-NEXT: icmp ult i32 %A, 123
}
-int %test3(int %A) {
- %B = div int 0, %A ; => 0, don't need to keep traps
- ret int %B
+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: @test7
+; CHECK-NEXT: add i32 %A, -20
+; CHECK-NEXT: icmp ult i32
}
-int %test4(int %A) {
- %B = div int %A, -1 ; 0-A
- ret int %B
+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: @test8
+; CHECK-NEXT: icmp ugt i8 %A, -11
}
-uint %test5(uint %A) {
- %B = div uint %A, 4294967280
- %C = div uint %B, 4294967292
- ret uint %C
+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: @test9
+; CHECK-NEXT: icmp ult i8 %A, -10
}
-bool %test6(uint %A) {
- %B = div uint %A, 123
- %C = seteq uint %B, 0 ; A < 123
- ret bool %C
-}
+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: @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: @test11
+; CHECK-NEXT: select i1 %C, i32 10, i32 5
+; CHECK-NEXT: lshr i32 %X
+}
-bool %test7(uint %A) {
- %B = div uint %A, 10
- %C = seteq uint %B, 2 ; A >= 20 && A < 30
- ret bool %C
+; PR2328
+define i32 @test12(i32 %x) nounwind {
+ %tmp3 = udiv i32 %x, %x ; 1
+ ret i32 %tmp3
+; CHECK: @test12
+; CHECK-NEXT: ret i32 1
}
-bool %test8(ubyte %A) {
- %B = div ubyte %A, 123
- %C = seteq ubyte %B, 2 ; A >= 246
- ret bool %C
-}
-
-bool %test9(ubyte %A) {
- %B = div ubyte %A, 123
- %C = setne ubyte %B, 2 ; A < 246
- ret bool %C
-}
-
-uint %test10(uint %X, bool %C) {
- %V = select bool %C, uint 64, uint 8
- %R = udiv uint %X, %V
- ret uint %R
+define i32 @test13(i32 %x) nounwind {
+ %tmp3 = sdiv i32 %x, %x ; 1
+ ret i32 %tmp3
+; CHECK: @test13
+; CHECK-NEXT: ret i32 1
}
-int %test11(int %X, bool %C) {
- %A = select bool %C, int 1024, int 32
- %B = udiv int %X, %A
- ret int %B
+define i32 @test14(i8 %x) nounwind {
+ %zext = zext i8 %x to i32
+ %div = udiv i32 %zext, 257 ; 0
+ ret i32 %div
+; CHECK: @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: @test15
+; CHECK-NEXT: add i32 %b, -2
+; CHECK-NEXT: lshr i32 %a,
+; CHECK-NEXT: ret i32
+}
+
+