| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| ; Fold |
| ; x s/EXACT (1 << y) |
| ; to |
| ; x a>>EXACT y |
| ; iff 1<<y is non-negative |
| |
| define i8 @t0(i8 %x) { |
| ; CHECK-LABEL: @t0( |
| ; CHECK-NEXT: [[DIV:%.*]] = ashr exact i8 [[X:%.*]], 5 |
| ; CHECK-NEXT: ret i8 [[DIV]] |
| ; |
| %div = sdiv exact i8 %x, 32 |
| ret i8 %div |
| } |
| define i8 @n1(i8 %x) { |
| ; CHECK-LABEL: @n1( |
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], 32 |
| ; CHECK-NEXT: ret i8 [[DIV]] |
| ; |
| %div = sdiv i8 %x, 32 ; not exact |
| ret i8 %div |
| } |
| define i8 @n2(i8 %x) { |
| ; CHECK-LABEL: @n2( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X:%.*]], -128 |
| ; CHECK-NEXT: [[DIV:%.*]] = zext i1 [[TMP1]] to i8 |
| ; CHECK-NEXT: ret i8 [[DIV]] |
| ; |
| %div = sdiv i8 %x, 128 ; negative divisor |
| ret i8 %div |
| } |
| |
| define <2 x i8> @t3_vec_splat(<2 x i8> %x) { |
| ; CHECK-LABEL: @t3_vec_splat( |
| ; CHECK-NEXT: [[DIV:%.*]] = ashr exact <2 x i8> [[X:%.*]], <i8 5, i8 5> |
| ; CHECK-NEXT: ret <2 x i8> [[DIV]] |
| ; |
| %div = sdiv exact <2 x i8> %x, <i8 32, i8 32> |
| ret <2 x i8> %div |
| } |
| |
| define <2 x i8> @t4_vec(<2 x i8> %x) { |
| ; CHECK-LABEL: @t4_vec( |
| ; CHECK-NEXT: [[DIV:%.*]] = ashr exact <2 x i8> [[X:%.*]], <i8 5, i8 4> |
| ; CHECK-NEXT: ret <2 x i8> [[DIV]] |
| ; |
| %div = sdiv exact <2 x i8> %x, <i8 32, i8 16> |
| ret <2 x i8> %div |
| } |
| |
| define <2 x i8> @n5_vec_undef(<2 x i8> %x) { |
| ; CHECK-LABEL: @n5_vec_undef( |
| ; CHECK-NEXT: ret <2 x i8> poison |
| ; |
| %div = sdiv exact <2 x i8> %x, <i8 32, i8 undef> |
| ret <2 x i8> %div |
| } |
| define <2 x i8> @n6_vec_negative(<2 x i8> %x) { |
| ; CHECK-LABEL: @n6_vec_negative( |
| ; CHECK-NEXT: [[DIV:%.*]] = sdiv exact <2 x i8> [[X:%.*]], <i8 32, i8 -128> |
| ; CHECK-NEXT: ret <2 x i8> [[DIV]] |
| ; |
| %div = sdiv exact <2 x i8> %x, <i8 32, i8 128> ; non-non-negative divisor |
| ret <2 x i8> %div |
| } |