298 lines
8.8 KiB
LLVM
298 lines
8.8 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; https://bugs.llvm.org/show_bug.cgi?id=38123
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; Pattern:
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; x & ~(-1 << y) == x
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; Should be transformed into:
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; x u<= ~(-1 << y)
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; That is then later transformed into:
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; (x >> y) == 0
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; ============================================================================ ;
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; Basic positive tests
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; ============================================================================ ;
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define i1 @p0(i8 %x, i8 %y) {
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; CHECK-LABEL: @p0(
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, -1
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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; ============================================================================ ;
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; Vector tests
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; ============================================================================ ;
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define <2 x i1> @p1_vec(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @p1_vec(
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <2 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X_HIGHBITS]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[TMP1]]
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;
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%t0 = shl <2 x i8> <i8 -1, i8 -1>, %y
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%t1 = xor <2 x i8> %t0, <i8 -1, i8 -1>
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%t2 = and <2 x i8> %t1, %x
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%ret = icmp eq <2 x i8> %t2, %x
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ret <2 x i1> %ret
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}
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define <3 x i1> @p2_vec_undef0(<3 x i8> %x, <3 x i8> %y) {
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; CHECK-LABEL: @p2_vec_undef0(
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <3 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <3 x i8> [[X_HIGHBITS]], zeroinitializer
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; CHECK-NEXT: ret <3 x i1> [[TMP1]]
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;
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%t0 = shl <3 x i8> <i8 -1, i8 undef, i8 -1>, %y
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%t1 = xor <3 x i8> %t0, <i8 -1, i8 -1, i8 -1>
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%t2 = and <3 x i8> %t1, %x
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%ret = icmp eq <3 x i8> %t2, %x
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ret <3 x i1> %ret
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}
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define <3 x i1> @p3_vec_undef0(<3 x i8> %x, <3 x i8> %y) {
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; CHECK-LABEL: @p3_vec_undef0(
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <3 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <3 x i8> [[X_HIGHBITS]], zeroinitializer
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; CHECK-NEXT: ret <3 x i1> [[TMP1]]
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;
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%t0 = shl <3 x i8> <i8 -1, i8 -1, i8 -1>, %y
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%t1 = xor <3 x i8> %t0, <i8 -1, i8 undef, i8 -1>
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%t2 = and <3 x i8> %t1, %x
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%ret = icmp eq <3 x i8> %t2, %x
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ret <3 x i1> %ret
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}
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define <3 x i1> @p4_vec_undef2(<3 x i8> %x, <3 x i8> %y) {
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; CHECK-LABEL: @p4_vec_undef2(
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr <3 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <3 x i8> [[X_HIGHBITS]], zeroinitializer
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; CHECK-NEXT: ret <3 x i1> [[TMP1]]
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;
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%t0 = shl <3 x i8> <i8 -1, i8 undef, i8 -1>, %y
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%t1 = xor <3 x i8> %t0, <i8 -1, i8 undef, i8 -1>
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%t2 = and <3 x i8> %t1, %x
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%ret = icmp eq <3 x i8> %t2, %x
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ret <3 x i1> %ret
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}
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; ============================================================================ ;
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; Commutativity tests.
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; ============================================================================ ;
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declare i8 @gen8()
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define i1 @c0(i8 %y) {
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; CHECK-LABEL: @c0(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, -1
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%x = call i8 @gen8()
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%t2 = and i8 %x, %t1 ; swapped order
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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define i1 @c1(i8 %y) {
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; CHECK-LABEL: @c1(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, -1
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%x = call i8 @gen8()
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %x, %t2 ; swapped order
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ret i1 %ret
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}
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define i1 @c2(i8 %y) {
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; CHECK-LABEL: @c2(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X]], [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, -1
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%x = call i8 @gen8()
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%t2 = and i8 %x, %t1 ; swapped order
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%ret = icmp eq i8 %x, %t2 ; swapped order
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ret i1 %ret
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}
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; ============================================================================ ;
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; One-use tests. We don't care about multi-uses here.
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; ============================================================================ ;
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declare void @use8(i8)
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define i1 @oneuse0(i8 %x, i8 %y) {
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; CHECK-LABEL: @oneuse0(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[T0]])
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; CHECK-NEXT: [[X_HIGHBITS:%.*]] = lshr i8 [[X:%.*]], [[Y]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X_HIGHBITS]], 0
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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call void @use8(i8 %t0)
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%t1 = xor i8 %t0, -1
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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define i1 @oneuse1(i8 %x, i8 %y) {
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; CHECK-LABEL: @oneuse1(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], -1
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; CHECK-NEXT: call void @use8(i8 [[T1]])
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; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, -1
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call void @use8(i8 %t1)
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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define i1 @oneuse2(i8 %x, i8 %y) {
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; CHECK-LABEL: @oneuse2(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[T2]])
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; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[T1]], [[X]]
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, -1
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%t2 = and i8 %t1, %x
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call void @use8(i8 %t2)
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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define i1 @oneuse3(i8 %x, i8 %y) {
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; CHECK-LABEL: @oneuse3(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[T0]])
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], -1
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; CHECK-NEXT: call void @use8(i8 [[T1]])
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; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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call void @use8(i8 %t0)
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%t1 = xor i8 %t0, -1
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call void @use8(i8 %t1)
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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define i1 @oneuse4(i8 %x, i8 %y) {
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; CHECK-LABEL: @oneuse4(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[T0]])
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[T2]])
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; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[T1]], [[X]]
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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call void @use8(i8 %t0)
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%t1 = xor i8 %t0, -1
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%t2 = and i8 %t1, %x
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call void @use8(i8 %t2)
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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define i1 @oneuse5(i8 %x, i8 %y) {
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; CHECK-LABEL: @oneuse5(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[T0]])
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], -1
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; CHECK-NEXT: call void @use8(i8 [[T1]])
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; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[T2]])
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; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[T1]], [[X]]
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; CHECK-NEXT: ret i1 [[TMP1]]
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;
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%t0 = shl i8 -1, %y
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call void @use8(i8 %t0)
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%t1 = xor i8 %t0, -1
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call void @use8(i8 %t1)
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%t2 = and i8 %t1, %x
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call void @use8(i8 %t2)
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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; ============================================================================ ;
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; Negative tests
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; ============================================================================ ;
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define i1 @n0(i8 %x, i8 %y, i8 %notx) {
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; CHECK-LABEL: @n0(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[T2]], [[NOTX:%.*]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, -1
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %t2, %notx ; not %x
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ret i1 %ret
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}
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define i1 @n1(i8 %x, i8 %y) {
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; CHECK-LABEL: @n1(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 1, [[Y:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[T2]], [[X]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%t0 = shl i8 1, %y ; not -1
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%t1 = xor i8 %t0, -1
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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define i1 @n2(i8 %x, i8 %y) {
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; CHECK-LABEL: @n2(
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; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i8 [[T0]], 1
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; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[T2]], [[X]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%t0 = shl i8 -1, %y
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%t1 = xor i8 %t0, 1 ; not -1
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%t2 = and i8 %t1, %x
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%ret = icmp eq i8 %t2, %x
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ret i1 %ret
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}
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