1; RUN: opt -simplifycfg -S < %s | FileCheck %s 2 3; We could hoist the div/rem in these tests because it's safe to do so. 4; PR31028 - https://bugs.llvm.org/show_bug.cgi?id=31028 5; ...but since there's a separate pass for that, don't bother. 6 7define i32 @hoist_sdiv(i32 %a, i32 %b) { 8; CHECK-LABEL: @hoist_sdiv( 9; CHECK-NEXT: entry: 10; CHECK-NEXT: [[REM:%.*]] = srem i32 %a, %b 11; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[REM]], 42 12; CHECK-NEXT: br i1 [[CMP]], label %if, label %end 13; CHECK: if: 14; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 %a, %b 15; CHECK-NEXT: br label %end 16; CHECK: end: 17; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[DIV]], %if ], [ 3, %entry ] 18; CHECK-NEXT: ret i32 [[RET]] 19; 20entry: 21 %rem = srem i32 %a, %b 22 %cmp = icmp eq i32 %rem, 42 23 br i1 %cmp, label %if, label %end 24 25if: 26 %div = sdiv i32 %a, %b 27 br label %end 28 29end: 30 %ret = phi i32 [ %div, %if ], [ 3, %entry ] 31 ret i32 %ret 32} 33 34define i64 @hoist_udiv(i64 %a, i64 %b) { 35; CHECK-LABEL: @hoist_udiv( 36; CHECK-NEXT: entry: 37; CHECK-NEXT: [[REM:%.*]] = urem i64 %a, %b 38; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[REM]], 42 39; CHECK-NEXT: br i1 [[CMP]], label %if, label %end 40; CHECK: if: 41; CHECK-NEXT: [[DIV:%.*]] = udiv i64 %a, %b 42; CHECK-NEXT: br label %end 43; CHECK: end: 44; CHECK-NEXT: [[RET:%.*]] = phi i64 [ [[DIV]], %if ], [ 3, %entry ] 45; CHECK-NEXT: ret i64 [[RET]] 46; 47entry: 48 %rem = urem i64 %a, %b 49 %cmp = icmp eq i64 %rem, 42 50 br i1 %cmp, label %if, label %end 51 52if: 53 %div = udiv i64 %a, %b 54 br label %end 55 56end: 57 %ret = phi i64 [ %div, %if ], [ 3, %entry ] 58 ret i64 %ret 59} 60 61define i16 @hoist_srem(i16 %a, i16 %b) { 62; CHECK-LABEL: @hoist_srem( 63; CHECK-NEXT: entry: 64; CHECK-NEXT: [[DIV:%.*]] = sdiv i16 %a, %b 65; CHECK-NEXT: [[CMP:%.*]] = icmp eq i16 [[DIV]], 42 66; CHECK-NEXT: br i1 [[CMP]], label %if, label %end 67; CHECK: if: 68; CHECK-NEXT: [[REM:%.*]] = srem i16 %a, %b 69; CHECK-NEXT: br label %end 70; CHECK: end: 71; CHECK-NEXT: [[RET:%.*]] = phi i16 [ [[REM]], %if ], [ 3, %entry ] 72; CHECK-NEXT: ret i16 [[RET]] 73; 74entry: 75 %div = sdiv i16 %a, %b 76 %cmp = icmp eq i16 %div, 42 77 br i1 %cmp, label %if, label %end 78 79if: 80 %rem = srem i16 %a, %b 81 br label %end 82 83end: 84 %ret = phi i16 [ %rem, %if ], [ 3, %entry ] 85 ret i16 %ret 86} 87 88define i8 @hoist_urem(i8 %a, i8 %b) { 89; CHECK-LABEL: @hoist_urem( 90; CHECK-NEXT: entry: 91; CHECK-NEXT: [[DIV:%.*]] = udiv i8 %a, %b 92; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[DIV]], 42 93; CHECK-NEXT: br i1 [[CMP]], label %if, label %end 94; CHECK: if: 95; CHECK-NEXT: [[REM:%.*]] = urem i8 %a, %b 96; CHECK-NEXT: br label %end 97; CHECK: end: 98; CHECK-NEXT: [[RET:%.*]] = phi i8 [ [[REM]], %if ], [ 3, %entry ] 99; CHECK-NEXT: ret i8 [[RET]] 100; 101entry: 102 %div = udiv i8 %a, %b 103 %cmp = icmp eq i8 %div, 42 104 br i1 %cmp, label %if, label %end 105 106if: 107 %rem = urem i8 %a, %b 108 br label %end 109 110end: 111 %ret = phi i8 [ %rem, %if ], [ 3, %entry ] 112 ret i8 %ret 113} 114 115