Syntax for asm goto:
Syntax:
asm [volatile] goto ( AssemblerTemplate
:
: InputOperands
: Clobbers
: GotoLabels)
Only input is allowed. Output is not allowed
Thanks.
Jennifer
-----Original Message-----
From: Eli Friedman via Phabricator [mailto:revi...@reviews.llvm.org]
Sent: Thursday, January 10, 2019 5:58 PM
To: craig.top...@gmail.com; Keane, Erich <erich.ke...@intel.com>;
ndesaulni...@google.com; chandl...@gmail.com; Yu, Jennifer
<jennifer...@intel.com>; syaghm...@apple.com
Cc: efrie...@codeaurora.org; srhi...@google.com; era...@google.com;
cfe-commits@lists.llvm.org
Subject: [PATCH] D56571: [RFC prototype] Implementation of asm-goto support in
LLVM
efriedma added a comment.
Missing changes to lib/Analysis/CFG.cpp.
================
Comment at: lib/Sema/SemaStmtAsm.cpp:470
+ if (NS->isGCCAsmGoto() &&
+ Exprs[ConstraintIdx]->getStmtClass() == Stmt::AddrLabelExprClass)
+ break;
----------------
This looks suspicious; an AddrLabelExpr could be an input or output, e.g.
`"r"(&&foo)`.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D56571/new/
https://reviews.llvm.org/D56571
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