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[NFC][InstCombine] Tests for x & (-1 >> y) == x -> x u<= (-1 >> y) fold
https://bugs.llvm.org/show_bug.cgi?id=38123 This pattern will be produced by Implicit Integer Truncation sanitizer, https://reviews.llvm.org/D48958 https://bugs.llvm.org/show_bug.cgi?id=21530 in unsigned case, therefore it is probably a good idea to improve it. https://rise4fun.com/Alive/Rny llvm-svn: 336796
This commit is contained in:
Roman Lebedev
parent
2dddfdaff5
commit
25a47d71d3
@ -0,0 +1,137 @@
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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 & C == x
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; Should be transformed into:
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; x u<= C
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; Iff: isPowerOf2(C + 1)
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; ============================================================================ ;
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; Basic positive tests
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; ============================================================================ ;
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define i1 @p0(i8 %x) {
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; CHECK-LABEL: @p0(
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
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; CHECK-NEXT: [[RET:%.*]] = icmp eq 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 eq i8 %tmp0, %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_splat(<2 x i8> %x) {
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; CHECK-LABEL: @p1_vec_splat(
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; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 3>
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; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP0]], [[X]]
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; CHECK-NEXT: ret <2 x i1> [[RET]]
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;
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%tmp0 = and <2 x i8> %x, <i8 3, i8 3>
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%ret = icmp eq <2 x i8> %tmp0, %x
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ret <2 x i1> %ret
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}
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define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) {
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; CHECK-LABEL: @p2_vec_nonsplat(
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; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 15>
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; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP0]], [[X]]
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; CHECK-NEXT: ret <2 x i1> [[RET]]
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;
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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 eq <2 x i8> %tmp0, %x
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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(<3 x i8> %x) {
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; CHECK-LABEL: @p3_vec_splat_undef(
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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 eq <3 x i8> [[TMP0]], [[X]]
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; CHECK-NEXT: ret <3 x i1> [[RET]]
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;
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%tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3>
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%ret = icmp eq <3 x i8> %tmp0, %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() {
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; CHECK-LABEL: @c0(
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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 eq 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 eq i8 %x, %tmp0 ; 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) {
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; CHECK-LABEL: @oneuse0(
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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 eq 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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call void @use8(i8 %tmp0)
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%ret = icmp eq i8 %tmp0, %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) {
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; CHECK-LABEL: @n0(
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 4
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP0]], [[X]]
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; CHECK-NEXT: ret i1 [[RET]]
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;
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%tmp0 = and i8 %x, 4 ; power-of-two, but invalid.
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%ret = icmp eq i8 %tmp0, %x
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ret i1 %ret
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}
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define i1 @n1(i8 %x, i8 %y, i8 %notx) {
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; CHECK-LABEL: @n1(
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; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP0]], [[NOTX:%.*]]
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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 eq 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(<2 x i8> %x) {
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; CHECK-LABEL: @n2(
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; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 16>
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; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP0]], [[X]]
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; CHECK-NEXT: ret <2 x i1> [[RET]]
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;
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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 eq <2 x i8> %tmp0, %x
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ret <2 x i1> %ret
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}
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@ -0,0 +1,177 @@
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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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; ============================================================================ ;
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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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq 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
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%ret = icmp eq i8 %tmp1, %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: [[TMP0:%.*]] = lshr <2 x i8> <i8 -1, i8 -1>, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and <2 x i8> [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP1]], [[X]]
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; CHECK-NEXT: ret <2 x i1> [[RET]]
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;
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%tmp0 = lshr <2 x i8> <i8 -1, i8 -1>, %y
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%tmp1 = and <2 x i8> %tmp0, %x
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%ret = icmp eq <2 x i8> %tmp1, %x
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ret <2 x i1> %ret
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}
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define <3 x i1> @p2_vec_undef(<3 x i8> %x, <3 x i8> %y) {
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; CHECK-LABEL: @p2_vec_undef(
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; CHECK-NEXT: [[TMP0:%.*]] = lshr <3 x i8> <i8 -1, i8 undef, i8 -1>, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and <3 x i8> [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq <3 x i8> [[TMP1]], [[X]]
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; CHECK-NEXT: ret <3 x i1> [[RET]]
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;
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%tmp0 = lshr <3 x i8> <i8 -1, i8 undef, i8 -1>, %y
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%tmp1 = and <3 x i8> %tmp0, %x
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%ret = icmp eq <3 x i8> %tmp1, %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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X]], [[TMP0]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq 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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%x = call i8 @gen8()
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%tmp1 = and i8 %x, %tmp0 ; swapped order
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%ret = icmp eq i8 %tmp1, %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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[X]], [[TMP1]]
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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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%x = call i8 @gen8()
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%tmp1 = and i8 %tmp0, %x
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%ret = icmp eq i8 %x, %tmp1 ; 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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X]], [[TMP0]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[X]], [[TMP1]]
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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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%x = call i8 @gen8()
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%tmp1 = and i8 %x, %tmp0 ; swapped order
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%ret = icmp eq i8 %x, %tmp1 ; 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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[TMP0]])
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq 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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call void @use8(i8 %tmp0)
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%tmp1 = and i8 %tmp0, %x
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%ret = icmp eq i8 %tmp1, %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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[TMP1]])
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; CHECK-NEXT: [[RET:%.*]] = icmp eq 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
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call void @use8(i8 %tmp1)
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%ret = icmp eq i8 %tmp1, %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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[TMP0]])
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[TMP1]])
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; CHECK-NEXT: [[RET:%.*]] = icmp eq 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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call void @use8(i8 %tmp0)
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%tmp1 = and i8 %tmp0, %x
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call void @use8(i8 %tmp1)
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%ret = icmp eq i8 %tmp1, %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: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP1]], [[NOTX:%.*]]
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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
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%ret = icmp eq i8 %tmp1, %notx ; not %x
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ret i1 %ret
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}
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