| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s |
| |
| ; https://bugs.llvm.org/show_bug.cgi?id=38123 |
| |
| ; Pattern: |
| ; x & ((-1 << y) >> y) == x |
| ; Should be transformed into: |
| ; x u<= ((-1 << y) >> y) |
| |
| ; This pattern is uncanonical, but we can not canonicalize it due to extra uses. |
| |
| declare void @use8(i8) |
| declare void @use2i8(<2 x i8>) |
| declare void @use3i8(<3 x i8>) |
| |
| ; ============================================================================ ; |
| ; Basic positive tests |
| ; ============================================================================ ; |
| |
| define i1 @p0(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @p0( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: [[RET:%.*]] = icmp uge i8 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y |
| %t2 = and i8 %t1, %x |
| %ret = icmp eq i8 %t2, %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: [[T0:%.*]] = shl <2 x i8> <i8 -1, i8 -1>, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use2i8(<2 x i8> [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr <2 x i8> [[T0]], [[Y]] |
| ; CHECK-NEXT: [[RET:%.*]] = icmp uge <2 x i8> [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: ret <2 x i1> [[RET]] |
| ; |
| %t0 = shl <2 x i8> <i8 -1, i8 -1>, %y |
| call void @use2i8(<2 x i8> %t0) |
| %t1 = lshr <2 x i8> %t0, %y |
| %t2 = and <2 x i8> %t1, %x |
| %ret = icmp eq <2 x i8> %t2, %x |
| ret <2 x i1> %ret |
| } |
| |
| define <3 x i1> @p2_vec_undef0(<3 x i8> %x, <3 x i8> %y) { |
| ; CHECK-LABEL: @p2_vec_undef0( |
| ; CHECK-NEXT: [[T0:%.*]] = shl <3 x i8> <i8 -1, i8 undef, i8 -1>, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use3i8(<3 x i8> [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr <3 x i8> [[T0]], [[Y]] |
| ; CHECK-NEXT: [[RET:%.*]] = icmp uge <3 x i8> [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: ret <3 x i1> [[RET]] |
| ; |
| %t0 = shl <3 x i8> <i8 -1, i8 undef, i8 -1>, %y |
| call void @use3i8(<3 x i8> %t0) |
| %t1 = lshr <3 x i8> %t0, %y |
| %t2 = and <3 x i8> %t1, %x |
| %ret = icmp eq <3 x i8> %t2, %x |
| ret <3 x i1> %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Commutativity tests. |
| ; ============================================================================ ; |
| |
| declare i8 @gen8() |
| |
| define i1 @c0(i8 %y) { |
| ; CHECK-LABEL: @c0( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X]], [[T1]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y |
| %x = call i8 @gen8() |
| %t2 = and i8 %x, %t1 ; swapped order |
| %ret = icmp eq i8 %t2, %x |
| ret i1 %ret |
| } |
| |
| define i1 @c1(i8 %y) { |
| ; CHECK-LABEL: @c1( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X]], [[T1]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y |
| %x = call i8 @gen8() |
| %t2 = and i8 %t1, %x |
| %ret = icmp eq i8 %x, %t2 ; swapped order |
| ret i1 %ret |
| } |
| |
| define i1 @c2(i8 %y) { |
| ; CHECK-LABEL: @c2( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8() |
| ; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X]], [[T1]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y |
| %x = call i8 @gen8() |
| %t2 = and i8 %x, %t1 ; swapped order |
| %ret = icmp eq i8 %x, %t2 ; swapped order |
| ret i1 %ret |
| } |
| |
| ; ============================================================================ ; |
| ; One-use tests. We don't care about multi-uses here. |
| ; ============================================================================ ; |
| |
| define i1 @oneuse0(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @oneuse0( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: call void @use8(i8 [[T1]]) |
| ; CHECK-NEXT: [[RET:%.*]] = icmp uge i8 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) ; needed anyway |
| %t1 = lshr i8 %t0, %y |
| call void @use8(i8 %t1) |
| %t2 = and i8 %t1, %x |
| %ret = icmp eq i8 %t2, %x |
| ret i1 %ret |
| } |
| |
| define i1 @oneuse1(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @oneuse1( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T2]]) |
| ; CHECK-NEXT: [[RET:%.*]] = icmp uge i8 [[T1]], [[X]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) ; needed anyway |
| %t1 = lshr i8 %t0, %y |
| %t2 = and i8 %t1, %x |
| call void @use8(i8 %t2) |
| %ret = icmp eq i8 %t2, %x |
| ret i1 %ret |
| } |
| |
| define i1 @oneuse2(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @oneuse2( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: call void @use8(i8 [[T1]]) |
| ; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T2]]) |
| ; CHECK-NEXT: [[RET:%.*]] = icmp uge i8 [[T1]], [[X]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y |
| call void @use8(i8 %t1) |
| %t2 = and i8 %t1, %x |
| call void @use8(i8 %t2) |
| %ret = icmp eq i8 %t2, %x |
| ret i1 %ret |
| } |
| |
| ; ============================================================================ ; |
| ; Negative tests |
| ; ============================================================================ ; |
| |
| define i1 @n0(i8 %x, i8 %y, i8 %notx) { |
| ; CHECK-LABEL: @n0( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]] |
| ; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[T2]], [[NOTX:%.*]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y |
| %t2 = and i8 %t1, %x |
| %ret = icmp eq i8 %t2, %notx ; not %x |
| ret i1 %ret |
| } |
| |
| define i1 @n1(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @n1( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i8 1, [[Y:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[RET:%.*]] = icmp ult i8 [[X:%.*]], 2 |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 1, %y ; not -1 |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y |
| %t2 = and i8 %t1, %x |
| %ret = icmp eq i8 %t2, %x |
| ret i1 %ret |
| } |
| |
| define i1 @n2(i8 %x, i8 %y1, i8 %y2) { |
| ; CHECK-LABEL: @n2( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y1:%.*]] |
| ; CHECK-NEXT: call void @use8(i8 [[T0]]) |
| ; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y2:%.*]] |
| ; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[T2]], [[X]] |
| ; CHECK-NEXT: ret i1 [[RET]] |
| ; |
| %t0 = shl i8 -1, %y1 ; not %y2 |
| call void @use8(i8 %t0) |
| %t1 = lshr i8 %t0, %y2 ; not %y1 |
| %t2 = and i8 %t1, %x |
| %ret = icmp eq i8 %t2, %x |
| ret i1 %ret |
| } |