| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| ; https://bugs.llvm.org/show_bug.cgi?id=38123 |
| |
| ; Pattern: |
| ; x & C == x |
| ; Should be transformed into: |
| ; x u<= C |
| ; Iff: isPowerOf2(C + 1) |
| ; C can be 0 and -1. |
| |
| ; ============================================================================ ; |
| ; Basic positive tests |
| ; ============================================================================ ; |
| |
| define i1 @p0(i8 %x) { |
| ; CHECK-LABEL: @p0( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[X:%.*]], 4 |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = and i8 %x, 3 |
| %ret = icmp eq i8 %tmp0, %x |
| ret i1 %ret |
| } |
| |
| define i1 @pv(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @pv( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[TMP0]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| %tmp1 = and i8 %tmp0, %x |
| %ret = icmp eq i8 %tmp1, %x |
| ret i1 %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Vector tests |
| ; ============================================================================ ; |
| |
| define <2 x i1> @p1_vec_splat(<2 x i8> %x) { |
| ; CHECK-LABEL: @p1_vec_splat( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <2 x i8> [[X:%.*]], <i8 4, i8 4> |
| ; CHECK-NEXT: ret <2 x i1> [[TMP1]] |
| ; |
| %tmp0 = and <2 x i8> %x, <i8 3, i8 3> |
| %ret = icmp eq <2 x i8> %tmp0, %x |
| ret <2 x i1> %ret |
| } |
| |
| define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) { |
| ; CHECK-LABEL: @p2_vec_nonsplat( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <2 x i8> [[X:%.*]], <i8 4, i8 16> |
| ; CHECK-NEXT: ret <2 x i1> [[TMP1]] |
| ; |
| %tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat. |
| %ret = icmp eq <2 x i8> %tmp0, %x |
| ret <2 x i1> %ret |
| } |
| |
| define <2 x i1> @p2_vec_nonsplat_edgecase0(<2 x i8> %x) { |
| ; CHECK-LABEL: @p2_vec_nonsplat_edgecase0( |
| ; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 0> |
| ; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP0]], [[X]] |
| ; CHECK-NEXT: ret <2 x i1> [[RET]] |
| ; |
| %tmp0 = and <2 x i8> %x, <i8 3, i8 0> |
| %ret = icmp eq <2 x i8> %tmp0, %x |
| ret <2 x i1> %ret |
| } |
| define <2 x i1> @p2_vec_nonsplat_edgecase1(<2 x i8> %x) { |
| ; CHECK-LABEL: @p2_vec_nonsplat_edgecase1( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ule <2 x i8> [[X:%.*]], <i8 3, i8 -1> |
| ; CHECK-NEXT: ret <2 x i1> [[TMP1]] |
| ; |
| %tmp0 = and <2 x i8> %x, <i8 3, i8 -1> |
| %ret = icmp eq <2 x i8> %tmp0, %x |
| ret <2 x i1> %ret |
| } |
| |
| define <3 x i1> @p3_vec_splat_undef(<3 x i8> %x) { |
| ; CHECK-LABEL: @p3_vec_splat_undef( |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <3 x i8> [[X:%.*]], <i8 4, i8 4, i8 4> |
| ; CHECK-NEXT: ret <3 x i1> [[TMP1]] |
| ; |
| %tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3> |
| %ret = icmp eq <3 x i8> %tmp0, %x |
| ret <3 x i1> %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Commutativity tests. |
| ; ============================================================================ ; |
| |
| declare i8 @gen8() |
| |
| define i1 @c0() { |
| ; CHECK-LABEL: @c0( |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[X]], 4 |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %x = call i8 @gen8() |
| %tmp0 = and i8 %x, 3 |
| %ret = icmp eq i8 %x, %tmp0 ; swapped order |
| ret i1 %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Commutativity tests with variable |
| ; ============================================================================ ; |
| |
| define i1 @cv0(i8 %y) { |
| ; CHECK-LABEL: @cv0( |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %x = call i8 @gen8() |
| %tmp0 = lshr i8 -1, %y |
| %tmp1 = and i8 %x, %tmp0 ; swapped order |
| %ret = icmp eq i8 %tmp1, %x |
| ret i1 %ret |
| } |
| |
| define i1 @cv1(i8 %y) { |
| ; CHECK-LABEL: @cv1( |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %x = call i8 @gen8() |
| %tmp0 = lshr i8 -1, %y |
| %tmp1 = and i8 %tmp0, %x |
| %ret = icmp eq i8 %x, %tmp1 ; swapped order |
| ret i1 %ret |
| } |
| |
| define i1 @cv2(i8 %y) { |
| ; CHECK-LABEL: @cv2( |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %x = call i8 @gen8() |
| %tmp0 = lshr i8 -1, %y |
| %tmp1 = and i8 %x, %tmp0 ; swapped order |
| %ret = icmp eq i8 %x, %tmp1 ; swapped order |
| ret i1 %ret |
| } |
| |
| ; ============================================================================ ; |
| ; One-use tests. We don't care about multi-uses here. |
| ; ============================================================================ ; |
| |
| declare void @use8(i8) |
| |
| define i1 @oneuse0(i8 %x) { |
| ; CHECK-LABEL: @oneuse0( |
| ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3 |
| ; CHECK-NEXT: call void @use8(i8 [[TMP0]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[X]], 4 |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = and i8 %x, 3 |
| call void @use8(i8 %tmp0) |
| %ret = icmp eq i8 %tmp0, %x |
| ret i1 %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Negative tests |
| ; ============================================================================ ; |
| |
| define i1 @n0(i8 %x) { |
| ; CHECK-LABEL: @n0( |
| ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 4 |
| ; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %tmp0 = and i8 %x, 4 ; power-of-two, but invalid. |
| %ret = icmp eq i8 %tmp0, %x |
| ret i1 %ret |
| } |
| |
| define i1 @n1(i8 %x, i8 %y, i8 %notx) { |
| ; CHECK-LABEL: @n1( |
| ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3 |
| ; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP0]], [[NOTX:%.*]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %tmp0 = and i8 %x, 3 |
| %ret = icmp eq i8 %tmp0, %notx ; not %x |
| ret i1 %ret |
| } |
| |
| define <2 x i1> @n2(<2 x i8> %x) { |
| ; CHECK-LABEL: @n2( |
| ; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 16> |
| ; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP0]], [[X]] |
| ; CHECK-NEXT: ret <2 x i1> [[RET]] |
| ; |
| %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid. |
| %ret = icmp eq <2 x i8> %tmp0, %x |
| ret <2 x i1> %ret |
| } |