[llvm-bugs] [Bug 43919] New: [X86] combineStore - unreachable code
via llvm-bugs
llvm-bugs at lists.llvm.org
Wed Nov 6 07:03:51 PST 2019
https://bugs.llvm.org/show_bug.cgi?id=43919
Bug ID: 43919
Summary: [X86] combineStore - unreachable code
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: llvm-dev at redking.me.uk
CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
llvm-dev at redking.me.uk, spatel+llvm at rotateright.com
Blocks: 30996
This code block contains logic that results in unreachable code:
if ((VT == MVT::i64 && F64IsLegal && !Subtarget.is64Bit()) &&
isa<LoadSDNode>(St->getValue()) &&
cast<LoadSDNode>(St->getValue())->isSimple() &&
St->getChain().hasOneUse() && St->isSimple()) {
if (Subtarget.is64Bit() || F64IsLegal) {
// ALWAYS TAKEN
}
// UNREACHABLE CODE
}
F64IsLegal is always true and Subtarget.is64Bit() is always false.
@craog - this seems to be a legacy of
-x86-experimental-vector-widening-legalization
Found by PVS Studio
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=30996
[Bug 30996] [META] PVS Studio Warnings
--
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20191106/3cb56f89/attachment.html>
More information about the llvm-bugs
mailing list