[PATCH] D41625: [DAGCombine] Fix for PR35765
Sam Parker via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Dec 29 01:55:52 PST 2017
samparker created this revision.
samparker added reviewers: dbabokin, craig.topper.
Remove the acceptance of ANY_EXTEND nodes while trying to move and nodes back to loads.
Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=35765
https://reviews.llvm.org/D41625
Files:
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
test/CodeGen/X86/pr35765.ll
Index: test/CodeGen/X86/pr35765.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/pr35765.ll
@@ -0,0 +1,42 @@
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu %s -o - | FileCheck %s
+
+ at ll = local_unnamed_addr global i64 0, align 8
+ at x = local_unnamed_addr global i64 2651237805702985558, align 8
+ at s1 = local_unnamed_addr global { i8, i8 } { i8 123, i8 5 }, align 2
+ at s2 = local_unnamed_addr global { i8, i8 } { i8 -122, i8 3 }, align 2
+
+; CHECK-LABEL: PR35765
+; CHECK: movzwl s1(%rip), %ecx
+; CHECK: addl $-1398, %ecx
+; CHECK: movl $4, %eax
+; CHECK: shll %cl, %eax
+; CHECK: movzwl x(%rip), %ecx
+; CHECK: movzwl s2(%rip), %edx
+; CHECK: notl %edx
+; CHECK: orl $63488, %edx
+; CHECK: movzwl %dx, %edx
+; CHECK: orl %ecx, %edx
+; CHECK: xorl %eax, %edx
+; CHECK: movslq %edx, %rax
+; CHECK: movq %rax, ll(%rip)
+; CHECK: retq
+define void @PR35765() {
+entry:
+ %bf.load.i = load i16, i16* bitcast ({ i8, i8 }* @s1 to i16*), align 2
+ %bf.clear.i = and i16 %bf.load.i, 2047
+ %conv.i = zext i16 %bf.clear.i to i32
+ %sub.i = add nsw i32 %conv.i, -1398
+ %shl.i = shl i32 4, %sub.i
+ %0 = load i64, i64* @x, align 8
+ %bf.load1.i = load i16, i16* bitcast ({ i8, i8 }* @s2 to i16*), align 2
+ %bf.clear2.i = and i16 %bf.load1.i, 2047
+ %1 = xor i16 %bf.clear2.i, -1
+ %neg.i = zext i16 %1 to i64
+ %or.i = or i64 %0, %neg.i
+ %conv5.i = trunc i64 %or.i to i32
+ %conv6.i = and i32 %conv5.i, 65535
+ %xor.i = xor i32 %conv6.i, %shl.i
+ %conv7.i = sext i32 %xor.i to i64
+ store i64 %conv7.i, i64* @ll, align 8
+ ret void
+}
Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3850,7 +3850,6 @@
return false;
}
case ISD::ZERO_EXTEND:
- case ISD::ANY_EXTEND:
case ISD::AssertZext: {
unsigned ActiveBits = Mask->getAPIntValue().countTrailingOnes();
EVT ExtVT = EVT::getIntegerVT(*DAG.getContext(), ActiveBits);
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D41625.128323.patch
Type: text/x-patch
Size: 2080 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20171229/3fa85238/attachment.bin>
More information about the llvm-commits
mailing list