| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s |
| |
| ; Fold |
| ; (%x - %y) u<= %x |
| ; to |
| ; @llvm.sub.with.overflow(%x, %y) + extractvalue + not |
| |
| define i1 @t0_basic(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t0_basic( |
| ; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[Y:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp ule i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define <2 x i1> @t1_vec(<2 x i8> %x, <2 x i8> %y) { |
| ; CHECK-LABEL: @t1_vec( |
| ; CHECK-NEXT: [[R:%.*]] = icmp ule <2 x i8> [[Y:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret <2 x i1> [[R]] |
| ; |
| %t0 = sub <2 x i8> %x, %y |
| %r = icmp ule <2 x i8> %t0, %x |
| ret <2 x i1> %r |
| } |
| |
| ; Commutativity |
| |
| define i1 @t2_commutative(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t2_commutative( |
| ; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[Y:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp uge i8 %x, %t0 ; swapped |
| ret i1 %r |
| } |
| |
| ; Extra-use tests |
| |
| declare void @use8(i8) |
| |
| define i1 @t3_extrause0(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t3_extrause0( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[Y]], [[X]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| call void @use8(i8 %t0) |
| %r = icmp ule i8 %t0, %x |
| ret i1 %r |
| } |
| |
| ; Negative tests |
| |
| define i1 @n4_not_commutative(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n4_not_commutative( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp ule i8 %t0, %y ; can't check against %y. |
| ret i1 %r |
| } |
| |
| define i1 @n5_wrong_pred0(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n5_wrong_pred0( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp ult i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define i1 @n6_wrong_pred1(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n6_wrong_pred1( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[T0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp uge i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define i1 @n7_wrong_pred2(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n7_wrong_pred2( |
| ; CHECK-NEXT: [[R:%.*]] = icmp eq i8 [[Y:%.*]], 0 |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp eq i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define i1 @n8_wrong_pred3(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n8_wrong_pred3( |
| ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[Y:%.*]], 0 |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp ne i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define i1 @n9_wrong_pred4(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n9_wrong_pred4( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp slt i8 [[T0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp slt i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define i1 @n10_wrong_pred5(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n10_wrong_pred5( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp sle i8 [[T0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp sle i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define i1 @n11_wrong_pred6(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n11_wrong_pred6( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp sgt i8 [[T0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp sgt i8 %t0, %x |
| ret i1 %r |
| } |
| |
| define i1 @n12_wrong_pred7(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n12_wrong_pred7( |
| ; CHECK-NEXT: [[T0:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp sge i8 [[T0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = sub i8 %x, %y |
| %r = icmp sge i8 %t0, %x |
| ret i1 %r |
| } |