forked from OSchip/llvm-project
[NFC][InstCombine] Tests for x s> x & (-1 >> y) to x s> (-1 >> y) fold.
https://bugs.llvm.org/show_bug.cgi?id=38123 https://rise4fun.com/Alive/I3O This pattern is not commutative! We must make sure not to fold the commuted version! llvm-svn: 337104
This commit is contained in:
Roman Lebedev
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3e65d9a6fa
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62d050d2c4
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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 s> x & C
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; Should be transformed into:
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; x s> C
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; Iff: isPowerOf2(C + 1)
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; NOTE: this pattern is not commutative!
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declare i8 @gen8()
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declare <2 x i8> @gen2x8()
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declare <3 x i8> @gen3x8()
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; ============================================================================ ;
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; Basic positive tests
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; ============================================================================ ;
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define i1 @p0() {
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; CHECK-LABEL: @p0(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP0]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%x = call i8 @gen8()
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%tmp0 = and i8 %x, 3
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%ret = icmp sgt i8 %x, %tmp0
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ret i1 %ret
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}
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define i1 @pv(i8 %y) {
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; CHECK-LABEL: @pv(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X]]
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP1]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%x = call i8 @gen8()
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%tmp0 = lshr i8 -1, %y
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%tmp1 = and i8 %tmp0, %x
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%ret = icmp sgt i8 %x, %tmp1
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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_splat() {
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; CHECK-LABEL: @p1_vec_splat(
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; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()
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; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 3>
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], [[TMP0]]
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; CHECK-NEXT: ret <2 x i1> [[RET]]
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;
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%x = call <2 x i8> @gen2x8()
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%tmp0 = and <2 x i8> %x, <i8 3, i8 3>
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%ret = icmp sgt <2 x i8> %x, %tmp0
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ret <2 x i1> %ret
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}
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define <2 x i1> @p2_vec_nonsplat() {
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; CHECK-LABEL: @p2_vec_nonsplat(
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; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()
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; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 15>
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], [[TMP0]]
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; CHECK-NEXT: ret <2 x i1> [[RET]]
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;
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%x = call <2 x i8> @gen2x8()
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%tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat.
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%ret = icmp sgt <2 x i8> %x, %tmp0
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ret <2 x i1> %ret
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}
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define <3 x i1> @p3_vec_splat_undef() {
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; CHECK-LABEL: @p3_vec_splat_undef(
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; CHECK-NEXT: [[X:%.*]] = call <3 x i8> @gen3x8()
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; CHECK-NEXT: [[TMP0:%.*]] = and <3 x i8> [[X]], <i8 3, i8 undef, i8 3>
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt <3 x i8> [[X]], [[TMP0]]
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; CHECK-NEXT: ret <3 x i1> [[RET]]
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;
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%x = call <3 x i8> @gen3x8()
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%tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3>
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%ret = icmp sgt <3 x i8> %x, %tmp0
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ret <3 x 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() {
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; CHECK-LABEL: @oneuse0(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3
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; CHECK-NEXT: call void @use8(i8 [[TMP0]])
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP0]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%x = call i8 @gen8()
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%tmp0 = and i8 %x, 3
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call void @use8(i8 %tmp0)
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%ret = icmp sgt i8 %x, %tmp0
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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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; ============================================================================ ;
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; Commutativity tests.
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; ============================================================================ ;
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define i1 @c0(i8 %x) {
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; CHECK-LABEL: @c0(
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP0]], [[X]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%tmp0 = and i8 %x, 3
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%ret = icmp sgt i8 %tmp0, %x ; swapped order
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ret i1 %ret
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}
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; ============================================================================ ;
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; Commutativity tests with variable
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; ============================================================================ ;
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; Ok, this one should fold. We only testing commutativity of 'and'.
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define i1 @cv0_GOOD(i8 %y) {
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; CHECK-LABEL: @cv0_GOOD(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X]]
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP1]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%x = call i8 @gen8()
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%tmp0 = lshr i8 -1, %y
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%tmp1 = and i8 %tmp0, %x ; swapped order
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%ret = icmp sgt i8 %x, %tmp1
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ret i1 %ret
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}
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define i1 @cv1(i8 %y) {
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; CHECK-LABEL: @cv1(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X]], [[TMP0]]
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP1]], [[X]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%x = call i8 @gen8()
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%tmp0 = lshr i8 -1, %y
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%tmp1 = and i8 %x, %tmp0
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%ret = icmp sgt i8 %tmp1, %x ; swapped order
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ret i1 %ret
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}
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define i1 @cv2(i8 %x, i8 %y) {
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; CHECK-LABEL: @cv2(
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; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP1]], [[X]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%tmp0 = lshr i8 -1, %y
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%tmp1 = and i8 %tmp0, %x ; swapped order
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%ret = icmp sgt i8 %tmp1, %x ; swapped order
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ret i1 %ret
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}
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; ============================================================================ ;
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; Normal negative tests
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; ============================================================================ ;
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define i1 @n0() {
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; CHECK-LABEL: @n0(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 4
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP0]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%x = call i8 @gen8()
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%tmp0 = and i8 %x, 4 ; power-of-two, but invalid.
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%ret = icmp sgt i8 %x, %tmp0
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ret i1 %ret
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}
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define i1 @n1(i8 %y, i8 %notx) {
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; CHECK-LABEL: @n1(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP0]], [[NOTX:%.*]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%x = call i8 @gen8()
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%tmp0 = and i8 %x, 3
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%ret = icmp sgt i8 %tmp0, %notx ; not %x
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ret i1 %ret
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}
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define <2 x i1> @n2() {
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; CHECK-LABEL: @n2(
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; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()
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; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 16>
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; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], [[TMP0]]
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; CHECK-NEXT: ret <2 x i1> [[RET]]
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;
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%x = call <2 x i8> @gen2x8()
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%tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.
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%ret = icmp sgt <2 x i8> %x, %tmp0
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ret <2 x i1> %ret
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}
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