1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=aggressive-instcombine -S | FileCheck %s 3 4define i16 @trunc_shl(i16 %x, i16 %y) { 5; CHECK-LABEL: @trunc_shl( 6; CHECK-NEXT: [[CMP0:%.*]] = icmp ult i16 [[Y:%.*]], 16 7; CHECK-NEXT: call void @llvm.assume(i1 [[CMP0]]) 8; CHECK-NEXT: [[I0:%.*]] = shl i16 [[X:%.*]], [[Y]] 9; CHECK-NEXT: ret i16 [[I0]] 10; 11 %cmp0 = icmp ult i16 %y, 16 12 call void @llvm.assume(i1 %cmp0) 13 14 %zextx = zext i16 %x to i32 15 %zexty = zext i16 %y to i32 16 17 %i0 = shl i32 %zextx, %zexty 18 %r = trunc i32 %i0 to i16 19 ret i16 %r 20} 21 22define i16 @trunc_lshr(i16 %x, i16 %y) { 23; CHECK-LABEL: @trunc_lshr( 24; CHECK-NEXT: [[CMP0:%.*]] = icmp ult i16 [[X:%.*]], 0 25; CHECK-NEXT: [[CMP1:%.*]] = icmp ult i16 [[Y:%.*]], 16 26; CHECK-NEXT: call void @llvm.assume(i1 [[CMP0]]) 27; CHECK-NEXT: call void @llvm.assume(i1 [[CMP1]]) 28; CHECK-NEXT: [[I0:%.*]] = lshr i16 [[X]], [[Y]] 29; CHECK-NEXT: ret i16 [[I0]] 30; 31 %cmp0 = icmp ult i16 %x, 65536 32 %cmp1 = icmp ult i16 %y, 16 33 call void @llvm.assume(i1 %cmp0) 34 call void @llvm.assume(i1 %cmp1) 35 36 %zextx = zext i16 %x to i32 37 %zexty = zext i16 %y to i32 38 39 %i0 = lshr i32 %zextx, %zexty 40 %r = trunc i32 %i0 to i16 41 ret i16 %r 42} 43 44define i16 @trunc_ashr(i16 %x, i16 %y) { 45; CHECK-LABEL: @trunc_ashr( 46; CHECK-NEXT: [[CMP0:%.*]] = icmp slt i16 [[X:%.*]], 32767 47; CHECK-NEXT: [[CMP1:%.*]] = icmp sge i16 [[X]], -32768 48; CHECK-NEXT: [[CMP2:%.*]] = icmp ult i16 [[Y:%.*]], 16 49; CHECK-NEXT: call void @llvm.assume(i1 [[CMP0]]) 50; CHECK-NEXT: call void @llvm.assume(i1 [[CMP1]]) 51; CHECK-NEXT: call void @llvm.assume(i1 [[CMP2]]) 52; CHECK-NEXT: [[I0:%.*]] = ashr i16 [[X]], [[Y]] 53; CHECK-NEXT: ret i16 [[I0]] 54; 55 %cmp0 = icmp slt i16 %x, 32767 56 %cmp1 = icmp sge i16 %x, -32768 57 %cmp2 = icmp ult i16 %y, 16 58 call void @llvm.assume(i1 %cmp0) 59 call void @llvm.assume(i1 %cmp1) 60 call void @llvm.assume(i1 %cmp2) 61 62 %zextx = sext i16 %x to i32 63 %zexty = sext i16 %y to i32 64 65 %i0 = ashr i32 %zextx, %zexty 66 %r = trunc i32 %i0 to i16 67 ret i16 %r 68} 69 70declare void @llvm.assume(i1) 71