| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s |
| |
| ; Fold |
| ; (-1 u/ %x) u< %y |
| ; to |
| ; @llvm.umul.with.overflow(%x, %y) + extractvalue |
| |
| define i1 @t0_basic(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t0_basic( |
| ; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 [[X:%.*]], i8 [[Y:%.*]]) |
| ; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { i8, i1 } [[MUL]], 1 |
| ; CHECK-NEXT: ret i1 [[MUL_OV]] |
| ; |
| %t0 = udiv i8 -1, %x |
| %r = icmp ult i8 %t0, %y |
| ret i1 %r |
| } |
| |
| define <2 x i1> @t1_vec(<2 x i8> %x, <2 x i8> %y) { |
| ; CHECK-LABEL: @t1_vec( |
| ; CHECK-NEXT: [[MUL:%.*]] = call { <2 x i8>, <2 x i1> } @llvm.umul.with.overflow.v2i8(<2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]]) |
| ; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { <2 x i8>, <2 x i1> } [[MUL]], 1 |
| ; CHECK-NEXT: ret <2 x i1> [[MUL_OV]] |
| ; |
| %t0 = udiv <2 x i8> <i8 -1, i8 -1>, %x |
| %r = icmp ult <2 x i8> %t0, %y |
| ret <2 x i1> %r |
| } |
| |
| define <3 x i1> @t2_vec_undef(<3 x i8> %x, <3 x i8> %y) { |
| ; CHECK-LABEL: @t2_vec_undef( |
| ; CHECK-NEXT: [[MUL:%.*]] = call { <3 x i8>, <3 x i1> } @llvm.umul.with.overflow.v3i8(<3 x i8> [[X:%.*]], <3 x i8> [[Y:%.*]]) |
| ; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { <3 x i8>, <3 x i1> } [[MUL]], 1 |
| ; CHECK-NEXT: ret <3 x i1> [[MUL_OV]] |
| ; |
| %t0 = udiv <3 x i8> <i8 -1, i8 undef, i8 -1>, %x |
| %r = icmp ult <3 x i8> %t0, %y |
| ret <3 x i1> %r |
| } |
| |
| declare i8 @gen8() |
| |
| define i1 @t3_commutative(i8 %x) { |
| ; CHECK-LABEL: @t3_commutative( |
| ; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[MUL:%.*]] = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 [[X:%.*]], i8 [[Y]]) |
| ; CHECK-NEXT: [[MUL_OV:%.*]] = extractvalue { i8, i1 } [[MUL]], 1 |
| ; CHECK-NEXT: ret i1 [[MUL_OV]] |
| ; |
| %t0 = udiv i8 -1, %x |
| %y = call i8 @gen8() |
| %r = icmp ugt i8 %y, %t0 ; swapped |
| ret i1 %r |
| } |
| |
| ; Negative tests |
| |
| declare void @use8(i8) |
| |
| define i1 @n4_extrause(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n4_extrause( |
| ; CHECK-NEXT: [[T0:%.*]] = udiv i8 -1, [[X:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[Y:%.*]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = udiv i8 -1, %x |
| call void @use8(i8 %t0) |
| %r = icmp ult i8 %t0, %y |
| ret i1 %r |
| } |
| |
| define i1 @n5_not_negone(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n5_not_negone( |
| ; CHECK-NEXT: [[T0:%.*]] = udiv i8 -2, [[X:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[Y:%.*]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = udiv i8 -2, %x ; not -1 |
| %r = icmp ult i8 %t0, %y |
| ret i1 %r |
| } |
| |
| define i1 @n6_wrong_pred0(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n6_wrong_pred0( |
| ; CHECK-NEXT: [[T0:%.*]] = udiv i8 -1, [[X:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[T0]], [[Y:%.*]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = udiv i8 -1, %x |
| %r = icmp ule i8 %t0, %y ; not ult |
| ret i1 %r |
| } |
| |
| define i1 @n6_wrong_pred1(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n6_wrong_pred1( |
| ; CHECK-NEXT: [[T0:%.*]] = udiv i8 -1, [[X:%.*]] |
| ; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[T0]], [[Y:%.*]] |
| ; CHECK-NEXT: ret i1 [[R]] |
| ; |
| %t0 = udiv i8 -1, %x |
| %r = icmp ugt i8 %t0, %y ; not ult |
| ret i1 %r |
| } |