[llvm] r337042 - [NFC][InstCombine] Tests for 'check for [no] signed truncation' pattern
Roman Lebedev via llvm-commits
llvm-commits at lists.llvm.org
Fri Jul 13 13:33:34 PDT 2018
Author: lebedevri
Date: Fri Jul 13 13:33:34 2018
New Revision: 337042
URL: http://llvm.org/viewvc/llvm-project?rev=337042&view=rev
Log:
[NFC][InstCombine] Tests for 'check for [no] signed truncation' pattern
[[ https://bugs.llvm.org/show_bug.cgi?id=38149 | PR38149 ]]
As discussed in https://reviews.llvm.org/D49179#1158957 and later,
the IR for 'check for [no] signed truncation' pattern can be improved:
https://rise4fun.com/Alive/gBf
^ that pattern will be produced by Implicit Integer Truncation sanitizer,
https://reviews.llvm.org/D48958 https://bugs.llvm.org/show_bug.cgi?id=21530
in signed case, therefore it is probably a good idea to improve it.
The DAGCombine will reverse this transform, see
https://reviews.llvm.org/D49266
Added:
llvm/trunk/test/Transforms/InstCombine/canonicalize-lack-of-signed-truncation-check.ll
llvm/trunk/test/Transforms/InstCombine/canonicalize-signed-truncation-check.ll
Added: llvm/trunk/test/Transforms/InstCombine/canonicalize-lack-of-signed-truncation-check.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/canonicalize-lack-of-signed-truncation-check.ll?rev=337042&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/canonicalize-lack-of-signed-truncation-check.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/canonicalize-lack-of-signed-truncation-check.ll Fri Jul 13 13:33:34 2018
@@ -0,0 +1,224 @@
+; 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=38149
+
+; Pattern:
+; ((%x << MaskedBits) a>> MaskedBits) == %x
+; Should be transformed into:
+; (add %x, (1 << (KeptBits-1))) u< (1 << KeptBits)
+; Where KeptBits = bitwidth(%x) - MaskedBits
+
+; ============================================================================ ;
+; Basic positive tests
+; ============================================================================ ;
+
+define i1 @p0(i8 %x) {
+; CHECK-LABEL: @p0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp eq i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+; ============================================================================ ;
+; Vector tests
+; ============================================================================ ;
+
+define <2 x i1> @p1_vec_splat(<2 x i8> %x) {
+; CHECK-LABEL: @p1_vec_splat(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i8> [[X:%.*]], <i8 4, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <2 x i8> [[TMP0]], <i8 4, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq <2 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <2 x i1> [[TMP2]]
+;
+ %tmp0 = shl <2 x i8> %x, <i8 4, i8 4>
+ %tmp1 = ashr exact <2 x i8> %tmp0, <i8 4, i8 4>
+ %tmp2 = icmp eq <2 x i8> %tmp1, %x
+ ret <2 x i1> %tmp2
+}
+
+define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) {
+; CHECK-LABEL: @p2_vec_nonsplat(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i8> [[X:%.*]], <i8 4, i8 5>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <2 x i8> [[TMP0]], <i8 4, i8 5>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq <2 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <2 x i1> [[TMP2]]
+;
+ %tmp0 = shl <2 x i8> %x, <i8 4, i8 5>
+ %tmp1 = ashr exact <2 x i8> %tmp0, <i8 4, i8 5>
+ %tmp2 = icmp eq <2 x i8> %tmp1, %x
+ ret <2 x i1> %tmp2
+}
+
+define <3 x i1> @p3_vec_undef0(<3 x i8> %x) {
+; CHECK-LABEL: @p3_vec_undef0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i8> [[X:%.*]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <3 x i8> [[TMP0]], <i8 4, i8 4, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq <3 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <3 x i1> [[TMP2]]
+;
+ %tmp0 = shl <3 x i8> %x, <i8 4, i8 undef, i8 4>
+ %tmp1 = ashr exact <3 x i8> %tmp0, <i8 4, i8 4, i8 4>
+ %tmp2 = icmp eq <3 x i8> %tmp1, %x
+ ret <3 x i1> %tmp2
+}
+
+define <3 x i1> @p4_vec_undef1(<3 x i8> %x) {
+; CHECK-LABEL: @p4_vec_undef1(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i8> [[X:%.*]], <i8 4, i8 4, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <3 x i8> [[TMP0]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq <3 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <3 x i1> [[TMP2]]
+;
+ %tmp0 = shl <3 x i8> %x, <i8 4, i8 4, i8 4>
+ %tmp1 = ashr exact <3 x i8> %tmp0, <i8 4, i8 undef, i8 4>
+ %tmp2 = icmp eq <3 x i8> %tmp1, %x
+ ret <3 x i1> %tmp2
+}
+
+define <3 x i1> @p5_vec_undef2(<3 x i8> %x) {
+; CHECK-LABEL: @p5_vec_undef2(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i8> [[X:%.*]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <3 x i8> [[TMP0]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq <3 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <3 x i1> [[TMP2]]
+;
+ %tmp0 = shl <3 x i8> %x, <i8 4, i8 undef, i8 4>
+ %tmp1 = ashr exact <3 x i8> %tmp0, <i8 4, i8 undef, i8 4>
+ %tmp2 = icmp eq <3 x i8> %tmp1, %x
+ ret <3 x i1> %tmp2
+}
+
+; ============================================================================ ;
+; Commutativity tests.
+; ============================================================================ ;
+
+declare i8 @gen8()
+
+define i1 @c0() {
+; CHECK-LABEL: @c0(
+; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[X]], [[TMP1]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %x = call i8 @gen8()
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp eq i8 %x, %tmp1 ; swapped order
+ ret i1 %tmp2
+}
+
+; ============================================================================ ;
+; One-use tests.
+; ============================================================================ ;
+
+declare void @use8(i8)
+
+define i1 @n_oneuse0(i8 %x) {
+; CHECK-LABEL: @n_oneuse0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP0]])
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ call void @use8(i8 %tmp0)
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp eq i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n_oneuse1(i8 %x) {
+; CHECK-LABEL: @n_oneuse1(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP1]])
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ call void @use8(i8 %tmp1)
+ %tmp2 = icmp eq i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n_oneuse2(i8 %x) {
+; CHECK-LABEL: @n_oneuse2(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP0]])
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP1]])
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ call void @use8(i8 %tmp0)
+ %tmp1 = ashr exact i8 %tmp0, 4
+ call void @use8(i8 %tmp1)
+ %tmp2 = icmp eq i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+; ============================================================================ ;
+; Negative tests
+; ============================================================================ ;
+
+define i1 @n0(i8 %x) {
+; CHECK-LABEL: @n0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 3
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 3 ; not 4
+ %tmp2 = icmp eq i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n1(i8 %x) {
+; CHECK-LABEL: @n1(
+; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[X:%.*]], 16
+; CHECK-NEXT: ret i1 [[TMP1]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = lshr exact i8 %tmp0, 4 ; not ashr
+ %tmp2 = icmp eq i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n2(i8 %x, i8 %y) {
+; CHECK-LABEL: @n2(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], [[Y:%.*]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp eq i8 %tmp1, %y ; not %x
+ ret i1 %tmp2
+}
+
+define <2 x i1> @n3_vec_nonsplat(<2 x i8> %x) {
+; CHECK-LABEL: @n3_vec_nonsplat(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i8> [[X:%.*]], <i8 4, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <2 x i8> [[TMP0]], <i8 4, i8 3>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp eq <2 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <2 x i1> [[TMP2]]
+;
+ %tmp0 = shl <2 x i8> %x, <i8 4, i8 4>
+ %tmp1 = ashr exact <2 x i8> %tmp0, <i8 4, i8 3> ; 3 instead of 4
+ %tmp2 = icmp eq <2 x i8> %tmp1, %x
+ ret <2 x i1> %tmp2
+}
Added: llvm/trunk/test/Transforms/InstCombine/canonicalize-signed-truncation-check.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/canonicalize-signed-truncation-check.ll?rev=337042&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/canonicalize-signed-truncation-check.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/canonicalize-signed-truncation-check.ll Fri Jul 13 13:33:34 2018
@@ -0,0 +1,224 @@
+; 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=38149
+
+; Pattern:
+; ((%x << MaskedBits) a>> MaskedBits) != %x
+; Should be transformed into:
+; (add %x, (1 << (KeptBits-1))) u>= (1 << KeptBits)
+; Where KeptBits = bitwidth(%x) - MaskedBits
+
+; ============================================================================ ;
+; Basic positive tests
+; ============================================================================ ;
+
+define i1 @p0(i8 %x) {
+; CHECK-LABEL: @p0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp ne i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+; ============================================================================ ;
+; Vector tests
+; ============================================================================ ;
+
+define <2 x i1> @p1_vec_splat(<2 x i8> %x) {
+; CHECK-LABEL: @p1_vec_splat(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i8> [[X:%.*]], <i8 4, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <2 x i8> [[TMP0]], <i8 4, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <2 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <2 x i1> [[TMP2]]
+;
+ %tmp0 = shl <2 x i8> %x, <i8 4, i8 4>
+ %tmp1 = ashr exact <2 x i8> %tmp0, <i8 4, i8 4>
+ %tmp2 = icmp ne <2 x i8> %tmp1, %x
+ ret <2 x i1> %tmp2
+}
+
+define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) {
+; CHECK-LABEL: @p2_vec_nonsplat(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i8> [[X:%.*]], <i8 4, i8 5>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <2 x i8> [[TMP0]], <i8 4, i8 5>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <2 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <2 x i1> [[TMP2]]
+;
+ %tmp0 = shl <2 x i8> %x, <i8 4, i8 5>
+ %tmp1 = ashr exact <2 x i8> %tmp0, <i8 4, i8 5>
+ %tmp2 = icmp ne <2 x i8> %tmp1, %x
+ ret <2 x i1> %tmp2
+}
+
+define <3 x i1> @p3_vec_undef0(<3 x i8> %x) {
+; CHECK-LABEL: @p3_vec_undef0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i8> [[X:%.*]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <3 x i8> [[TMP0]], <i8 4, i8 4, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <3 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <3 x i1> [[TMP2]]
+;
+ %tmp0 = shl <3 x i8> %x, <i8 4, i8 undef, i8 4>
+ %tmp1 = ashr exact <3 x i8> %tmp0, <i8 4, i8 4, i8 4>
+ %tmp2 = icmp ne <3 x i8> %tmp1, %x
+ ret <3 x i1> %tmp2
+}
+
+define <3 x i1> @p4_vec_undef1(<3 x i8> %x) {
+; CHECK-LABEL: @p4_vec_undef1(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i8> [[X:%.*]], <i8 4, i8 4, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <3 x i8> [[TMP0]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <3 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <3 x i1> [[TMP2]]
+;
+ %tmp0 = shl <3 x i8> %x, <i8 4, i8 4, i8 4>
+ %tmp1 = ashr exact <3 x i8> %tmp0, <i8 4, i8 undef, i8 4>
+ %tmp2 = icmp ne <3 x i8> %tmp1, %x
+ ret <3 x i1> %tmp2
+}
+
+define <3 x i1> @p5_vec_undef2(<3 x i8> %x) {
+; CHECK-LABEL: @p5_vec_undef2(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <3 x i8> [[X:%.*]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <3 x i8> [[TMP0]], <i8 4, i8 undef, i8 4>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <3 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <3 x i1> [[TMP2]]
+;
+ %tmp0 = shl <3 x i8> %x, <i8 4, i8 undef, i8 4>
+ %tmp1 = ashr exact <3 x i8> %tmp0, <i8 4, i8 undef, i8 4>
+ %tmp2 = icmp ne <3 x i8> %tmp1, %x
+ ret <3 x i1> %tmp2
+}
+
+; ============================================================================ ;
+; Commutativity tests.
+; ============================================================================ ;
+
+declare i8 @gen8()
+
+define i1 @c0() {
+; CHECK-LABEL: @c0(
+; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i8 [[X]], [[TMP1]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %x = call i8 @gen8()
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp ne i8 %x, %tmp1 ; swapped order
+ ret i1 %tmp2
+}
+
+; ============================================================================ ;
+; One-use tests.
+; ============================================================================ ;
+
+declare void @use8(i8)
+
+define i1 @n_oneuse0(i8 %x) {
+; CHECK-LABEL: @n_oneuse0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP0]])
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ call void @use8(i8 %tmp0)
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp ne i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n_oneuse1(i8 %x) {
+; CHECK-LABEL: @n_oneuse1(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP1]])
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ call void @use8(i8 %tmp1)
+ %tmp2 = icmp ne i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n_oneuse2(i8 %x) {
+; CHECK-LABEL: @n_oneuse2(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP0]])
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: call void @use8(i8 [[TMP1]])
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ call void @use8(i8 %tmp0)
+ %tmp1 = ashr exact i8 %tmp0, 4
+ call void @use8(i8 %tmp1)
+ %tmp2 = icmp ne i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+; ============================================================================ ;
+; Negative tests
+; ============================================================================ ;
+
+define i1 @n0(i8 %x) {
+; CHECK-LABEL: @n0(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 3
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i8 [[TMP1]], [[X]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 3 ; not 4
+ %tmp2 = icmp ne i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n1(i8 %x) {
+; CHECK-LABEL: @n1(
+; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X:%.*]], 15
+; CHECK-NEXT: ret i1 [[TMP1]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = lshr exact i8 %tmp0, 4 ; not ashr
+ %tmp2 = icmp ne i8 %tmp1, %x
+ ret i1 %tmp2
+}
+
+define i1 @n2(i8 %x, i8 %y) {
+; CHECK-LABEL: @n2(
+; CHECK-NEXT: [[TMP0:%.*]] = shl i8 [[X:%.*]], 4
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i8 [[TMP0]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i8 [[TMP1]], [[Y:%.*]]
+; CHECK-NEXT: ret i1 [[TMP2]]
+;
+ %tmp0 = shl i8 %x, 4
+ %tmp1 = ashr exact i8 %tmp0, 4
+ %tmp2 = icmp ne i8 %tmp1, %y ; not %x
+ ret i1 %tmp2
+}
+
+define <2 x i1> @n3_vec_nonsplat(<2 x i8> %x) {
+; CHECK-LABEL: @n3_vec_nonsplat(
+; CHECK-NEXT: [[TMP0:%.*]] = shl <2 x i8> [[X:%.*]], <i8 4, i8 4>
+; CHECK-NEXT: [[TMP1:%.*]] = ashr exact <2 x i8> [[TMP0]], <i8 4, i8 3>
+; CHECK-NEXT: [[TMP2:%.*]] = icmp ne <2 x i8> [[TMP1]], [[X]]
+; CHECK-NEXT: ret <2 x i1> [[TMP2]]
+;
+ %tmp0 = shl <2 x i8> %x, <i8 4, i8 4>
+ %tmp1 = ashr exact <2 x i8> %tmp0, <i8 4, i8 3> ; 3 instead of 4
+ %tmp2 = icmp ne <2 x i8> %tmp1, %x
+ ret <2 x i1> %tmp2
+}
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