canonicalize-low-bit-mask-and-icmp-ne-to-icmp-ugt.ll
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; 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 ult i8 [[TMP0]], [[X:%.*]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%tmp0 = lshr i8 -1, %y
%tmp1 = and i8 %tmp0, %x
%ret = icmp ne 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 ult <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 ne <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 ult <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 ne <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 ugt 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 ne 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 ugt i8 [[X]], [[TMP0]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%tmp0 = lshr i8 -1, %y
%x = call i8 @gen8()
%tmp1 = and i8 %tmp0, %x
%ret = icmp ne 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 ugt 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 ne 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 ult 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 ne 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 ult 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 ne 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 ult 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 ne 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 ne i8 [[TMP1]], [[NOTX:%.*]]
; CHECK-NEXT: ret i1 [[RET]]
;
%tmp0 = lshr i8 -1, %y
%tmp1 = and i8 %tmp0, %x
%ret = icmp ne i8 %tmp1, %notx ; not %x
ret i1 %ret
}