| ; 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 & (-1 >> y) == x |
| ; Should be transformed into: |
| ; x u<= (-1 >> y) |
| |
| ; ============================================================================ ; |
| ; Basic positive tests |
| ; ============================================================================ ; |
| |
| define i1 @p0(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @p0( |
| ; 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(<2 x i8> %x, <2 x i8> %y) { |
| ; CHECK-LABEL: @p1_vec( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr <2 x i8> <i8 -1, i8 -1>, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp uge <2 x i8> [[TMP0]], [[X:%.*]] |
| ; CHECK-NEXT: ret <2 x i1> [[TMP1]] |
| ; |
| %tmp0 = lshr <2 x i8> <i8 -1, i8 -1>, %y |
| %tmp1 = and <2 x i8> %tmp0, %x |
| %ret = icmp eq <2 x i8> %tmp1, %x |
| ret <2 x i1> %ret |
| } |
| |
| define <3 x i1> @p2_vec_undef(<3 x i8> %x, <3 x i8> %y) { |
| ; CHECK-LABEL: @p2_vec_undef( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr <3 x i8> <i8 -1, i8 undef, i8 -1>, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp uge <3 x i8> [[TMP0]], [[X:%.*]] |
| ; CHECK-NEXT: ret <3 x i1> [[TMP1]] |
| ; |
| %tmp0 = lshr <3 x i8> <i8 -1, i8 undef, i8 -1>, %y |
| %tmp1 = and <3 x i8> %tmp0, %x |
| %ret = icmp eq <3 x i8> %tmp1, %x |
| ret <3 x i1> %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Commutativity tests. |
| ; ============================================================================ ; |
| |
| declare i8 @gen8() |
| |
| define i1 @c0(i8 %y) { |
| ; CHECK-LABEL: @c0( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| %x = call i8 @gen8() |
| %tmp1 = and i8 %x, %tmp0 ; swapped order |
| %ret = icmp eq i8 %tmp1, %x |
| ret i1 %ret |
| } |
| |
| define i1 @c1(i8 %y) { |
| ; CHECK-LABEL: @c1( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| %x = call i8 @gen8() |
| %tmp1 = and i8 %tmp0, %x |
| %ret = icmp eq i8 %x, %tmp1 ; swapped order |
| ret i1 %ret |
| } |
| |
| define i1 @c2(i8 %y) { |
| ; CHECK-LABEL: @c2( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| %x = call i8 @gen8() |
| %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, i8 %y) { |
| ; CHECK-LABEL: @oneuse0( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[TMP0]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[TMP0]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| call void @use8(i8 %tmp0) |
| %tmp1 = and i8 %tmp0, %x |
| %ret = icmp eq i8 %tmp1, %x |
| ret i1 %ret |
| } |
| |
| define i1 @oneuse1(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @oneuse1( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[TMP1]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[TMP0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| %tmp1 = and i8 %tmp0, %x |
| call void @use8(i8 %tmp1) |
| %ret = icmp eq i8 %tmp1, %x |
| ret i1 %ret |
| } |
| |
| define i1 @oneuse2(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @oneuse2( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[TMP0]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[TMP1]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[TMP0]], [[X]] |
| ; CHECK-NEXT: ret i1 [[TMP1]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| call void @use8(i8 %tmp0) |
| %tmp1 = and i8 %tmp0, %x |
| call void @use8(i8 %tmp1) |
| %ret = icmp eq i8 %tmp1, %x |
| ret i1 %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Negative tests |
| ; ============================================================================ ; |
| |
| define i1 @n0(i8 %x, i8 %y, i8 %notx) { |
| ; CHECK-LABEL: @n0( |
| ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]] |
| ; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP1]], [[NOTX:%.*]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %tmp0 = lshr i8 -1, %y |
| %tmp1 = and i8 %tmp0, %x |
| %ret = icmp eq i8 %tmp1, %notx ; not %x |
| ret i1 %ret |
| } |