| ; RUN: opt < %s -instsimplify -S | FileCheck %s |
| |
| ; Division-by-zero is undef. UB in any vector lane means the whole op is undef. |
| |
| define <2 x i8> @sdiv_zero_elt_vec_constfold(<2 x i8> %x) { |
| ; CHECK-LABEL: @sdiv_zero_elt_vec_constfold( |
| ; CHECK-NEXT: ret <2 x i8> undef |
| ; |
| %div = sdiv <2 x i8> <i8 1, i8 2>, <i8 0, i8 -42> |
| ret <2 x i8> %div |
| } |
| |
| define <2 x i8> @udiv_zero_elt_vec_constfold(<2 x i8> %x) { |
| ; CHECK-LABEL: @udiv_zero_elt_vec_constfold( |
| ; CHECK-NEXT: ret <2 x i8> undef |
| ; |
| %div = udiv <2 x i8> <i8 1, i8 2>, <i8 42, i8 0> |
| ret <2 x i8> %div |
| } |
| |
| define <2 x i8> @sdiv_zero_elt_vec(<2 x i8> %x) { |
| ; CHECK-LABEL: @sdiv_zero_elt_vec( |
| ; CHECK-NEXT: ret <2 x i8> undef |
| ; |
| %div = sdiv <2 x i8> %x, <i8 -42, i8 0> |
| ret <2 x i8> %div |
| } |
| |
| define <2 x i8> @udiv_zero_elt_vec(<2 x i8> %x) { |
| ; CHECK-LABEL: @udiv_zero_elt_vec( |
| ; CHECK-NEXT: ret <2 x i8> undef |
| ; |
| %div = udiv <2 x i8> %x, <i8 0, i8 42> |
| ret <2 x i8> %div |
| } |
| |
| ; Division-by-zero is undef. UB in any vector lane means the whole op is undef. |
| ; Thus, we can simplify this: if any element of 'y' is 0, we can do anything. |
| ; Therefore, assume that all elements of 'y' must be 1. |
| |
| define <2 x i1> @sdiv_bool_vec(<2 x i1> %x, <2 x i1> %y) { |
| ; CHECK-LABEL: @sdiv_bool_vec( |
| ; CHECK-NEXT: ret <2 x i1> %x |
| ; |
| %div = sdiv <2 x i1> %x, %y |
| ret <2 x i1> %div |
| } |
| |
| define <2 x i1> @udiv_bool_vec(<2 x i1> %x, <2 x i1> %y) { |
| ; CHECK-LABEL: @udiv_bool_vec( |
| ; CHECK-NEXT: ret <2 x i1> %x |
| ; |
| %div = udiv <2 x i1> %x, %y |
| ret <2 x i1> %div |
| } |
| |
| declare i32 @external() |
| |
| define i32 @div1() { |
| ; CHECK-LABEL: @div1( |
| ; CHECK-NEXT: [[CALL:%.*]] = call i32 @external(), !range !0 |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %call = call i32 @external(), !range !0 |
| %urem = udiv i32 %call, 3 |
| ret i32 %urem |
| } |
| |
| !0 = !{i32 0, i32 3} |