-; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
-; RUN: grep urem %t | count 3
-; RUN: grep srem %t | count 1
-; RUN: grep sub %t | count 2
-; RUN: grep add %t | count 1
+; RUN: opt < %s -instcombine -S | FileCheck %s
; PR3103
define i8 @test1(i8 %x, i8 %y) {
+; CHECK-LABEL: @test1(
%A = udiv i8 %x, %y
+; CHECK-NEXT: urem
%B = mul i8 %A, %y
%C = sub i8 %x, %B
ret i8 %C
+; CHECK-NEXT: ret
}
define i8 @test2(i8 %x, i8 %y) {
+; CHECK-LABEL: @test2(
%A = sdiv i8 %x, %y
+; CHECK-NEXT: srem
%B = mul i8 %A, %y
%C = sub i8 %x, %B
ret i8 %C
+; CHECK-NEXT: ret
}
define i8 @test3(i8 %x, i8 %y) {
+; CHECK-LABEL: @test3(
%A = udiv i8 %x, %y
+; CHECK-NEXT: urem
%B = mul i8 %A, %y
%C = sub i8 %B, %x
+; CHECK-NEXT: sub
ret i8 %C
+; CHECK-NEXT: ret
}
define i8 @test4(i8 %x) {
+; CHECK-LABEL: @test4(
%A = udiv i8 %x, 3
+; CHECK-NEXT: urem
%B = mul i8 %A, -3
+; CHECK-NEXT: sub
%C = sub i8 %x, %B
+; CHECK-NEXT: add
ret i8 %C
+; CHECK-NEXT: ret
+}
+
+define i32 @test5(i32 %x, i32 %y) {
+; CHECK-LABEL: @test5(
+; (((X / Y) * Y) / Y) -> X / Y
+ %div = sdiv i32 %x, %y
+; CHECK-NEXT: sdiv
+ %mul = mul i32 %div, %y
+ %r = sdiv i32 %mul, %y
+ ret i32 %r
+; CHECK-NEXT: ret
+}
+
+define i32 @test6(i32 %x, i32 %y) {
+; CHECK-LABEL: @test6(
+; (((X / Y) * Y) / Y) -> X / Y
+ %div = udiv i32 %x, %y
+; CHECK-NEXT: udiv
+ %mul = mul i32 %div, %y
+ %r = udiv i32 %mul, %y
+ ret i32 %r
+; CHECK-NEXT: ret
}