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TheRock/compiler/amd-llvm/llvm/test/Transforms/InstCombine/canonicalize-low-bit-mask-v3-and-icmp-eq-to-icmp-ule.ll
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

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; 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) + (-1)) == x
; Should be transformed into:
; x u<= ((1 << y) + (-1))
; That is then later transformed into:
; (x >> y) == 0
; 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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X:%.*]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0)
%t1 = add i8 %t0, -1
%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 nuw <2 x i8> splat (i8 1), [[Y:%.*]]
; CHECK-NEXT: call void @use2i8(<2 x i8> [[T0]])
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <2 x i8> [[X:%.*]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[X_HIGHBITS]], zeroinitializer
; 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 = add <2 x i8> %t0, <i8 -1, i8 -1>
%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_poison0(<3 x i8> %x, <3 x i8> %y) {
; CHECK-LABEL: @p2_vec_poison0(
; CHECK-NEXT: [[T0:%.*]] = shl nuw <3 x i8> <i8 1, i8 poison, i8 1>, [[Y:%.*]]
; CHECK-NEXT: call void @use3i8(<3 x i8> [[T0]])
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <3 x i8> [[X:%.*]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq <3 x i8> [[X_HIGHBITS]], zeroinitializer
; CHECK-NEXT: ret <3 x i1> [[RET]]
;
%t0 = shl <3 x i8> <i8 1, i8 poison, i8 1>, %y
call void @use3i8(<3 x i8> %t0)
%t1 = add <3 x i8> %t0, <i8 -1, i8 -1, i8 -1>
%t2 = and <3 x i8> %t1, %x
%ret = icmp eq <3 x i8> %t2, %x
ret <3 x i1> %ret
}
define <3 x i1> @p3_vec_poison0(<3 x i8> %x, <3 x i8> %y) {
; CHECK-LABEL: @p3_vec_poison0(
; CHECK-NEXT: [[T0:%.*]] = shl nuw <3 x i8> splat (i8 1), [[Y:%.*]]
; CHECK-NEXT: call void @use3i8(<3 x i8> [[T0]])
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <3 x i8> [[X:%.*]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq <3 x i8> [[X_HIGHBITS]], zeroinitializer
; CHECK-NEXT: ret <3 x i1> [[RET]]
;
%t0 = shl <3 x i8> <i8 1, i8 1, i8 1>, %y
call void @use3i8(<3 x i8> %t0)
%t1 = add <3 x i8> %t0, <i8 -1, i8 poison, i8 -1>
%t2 = and <3 x i8> %t1, %x
%ret = icmp eq <3 x i8> %t2, %x
ret <3 x i1> %ret
}
define <3 x i1> @p4_vec_poiso2(<3 x i8> %x, <3 x i8> %y) {
; CHECK-LABEL: @p4_vec_poiso2(
; CHECK-NEXT: [[T0:%.*]] = shl nuw <3 x i8> <i8 1, i8 poison, i8 1>, [[Y:%.*]]
; CHECK-NEXT: call void @use3i8(<3 x i8> [[T0]])
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <3 x i8> [[X:%.*]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq <3 x i8> [[X_HIGHBITS]], zeroinitializer
; CHECK-NEXT: ret <3 x i1> [[RET]]
;
%t0 = shl <3 x i8> <i8 1, i8 poison, i8 1>, %y
call void @use3i8(<3 x i8> %t0)
%t1 = add <3 x i8> %t0, <i8 -1, i8 poison, i8 -1>
%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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0)
%t1 = add i8 %t0, -1
%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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0)
%t1 = add i8 %t0, -1
%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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X]], [[Y]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0)
%t1 = add i8 %t0, -1
%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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = add i8 [[T0]], -1
; CHECK-NEXT: call void @use8(i8 [[T1]])
; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X:%.*]], [[T1]]
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0) ; needed anyway
%t1 = add i8 %t0, -1
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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = add i8 [[T0]], -1
; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T2]])
; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X]], [[T1]]
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0) ; needed anyway
%t1 = add i8 %t0, -1
%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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = add i8 [[T0]], -1
; 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 ule i8 [[X]], [[T1]]
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0)
%t1 = add i8 %t0, -1
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 nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = add i8 [[T0]], -1
; 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 = add i8 %t0, -1
%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 nsw i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[TMP1:%.*]] = sub i8 0, [[T0]]
; CHECK-NEXT: [[TMP2:%.*]] = and i8 [[X:%.*]], [[TMP1]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP2]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 -1, %y ; not 1
call void @use8(i8 %t0)
%t1 = add i8 %t0, -1
%t2 = and i8 %t1, %x
%ret = icmp eq i8 %t2, %x
ret i1 %ret
}
define i1 @n2(i8 %x, i8 %y) {
; CHECK-LABEL: @n2(
; CHECK-NEXT: [[T0:%.*]] = shl nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[TMP1:%.*]] = sub nuw i8 -2, [[T0]]
; CHECK-NEXT: [[TMP2:%.*]] = and i8 [[X:%.*]], [[TMP1]]
; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP2]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 1, %y
call void @use8(i8 %t0)
%t1 = add i8 %t0, 1 ; not -1
%t2 = and i8 %t1, %x
%ret = icmp eq i8 %t2, %x
ret i1 %ret
}
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