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      1 ; RUN: opt < %s -instcombine -S | FileCheck %s
      2 ; PR3103
      3 
      4 define i8 @test1(i8 %x, i8 %y) {
      5 ; CHECK-LABEL: @test1(
      6   %A = udiv i8 %x, %y
      7 ; CHECK-NEXT: urem
      8   %B = mul i8 %A, %y
      9   %C = sub i8 %x, %B
     10   ret i8 %C
     11 ; CHECK-NEXT: ret
     12 }
     13 
     14 define i8 @test2(i8 %x, i8 %y) {
     15 ; CHECK-LABEL: @test2(
     16   %A = sdiv i8 %x, %y
     17 ; CHECK-NEXT: srem
     18   %B = mul i8 %A, %y
     19   %C = sub i8 %x, %B
     20   ret i8 %C
     21 ; CHECK-NEXT: ret
     22 }
     23 
     24 define i8 @test3(i8 %x, i8 %y) {
     25 ; CHECK-LABEL: @test3(
     26   %A = udiv i8 %x, %y
     27 ; CHECK-NEXT: urem
     28   %B = mul i8 %A, %y
     29   %C = sub i8 %B, %x
     30 ; CHECK-NEXT: sub
     31   ret i8 %C
     32 ; CHECK-NEXT: ret
     33 }
     34 
     35 define i8 @test4(i8 %x) {
     36 ; CHECK-LABEL: @test4(
     37   %A = udiv i8 %x, 3
     38 ; CHECK-NEXT: urem
     39   %B = mul i8 %A, -3
     40 ; CHECK-NEXT: sub
     41   %C = sub i8 %x, %B
     42 ; CHECK-NEXT: add
     43   ret i8 %C
     44 ; CHECK-NEXT: ret
     45 }
     46 
     47 define i32 @test5(i32 %x, i32 %y) {
     48 ; CHECK-LABEL: @test5(
     49 ; (((X / Y) * Y) / Y) -> X / Y
     50   %div = sdiv i32 %x, %y
     51 ; CHECK-NEXT: sdiv
     52   %mul = mul i32 %div, %y
     53   %r = sdiv i32 %mul, %y
     54   ret i32 %r
     55 ; CHECK-NEXT: ret
     56 }
     57 
     58 define i32 @test6(i32 %x, i32 %y) {
     59 ; CHECK-LABEL: @test6(
     60 ; (((X / Y) * Y) / Y) -> X / Y
     61   %div = udiv i32 %x, %y
     62 ; CHECK-NEXT: udiv
     63   %mul = mul i32 %div, %y
     64   %r = udiv i32 %mul, %y
     65   ret i32 %r
     66 ; CHECK-NEXT: ret
     67 }
     68