From: Craig Topper <craig.topper@intel.com>
Date: Mon, 17 Aug 2020 06:27:41 +0000 (-0700)
Subject: [X86] Reject dirflag in inline asm constraints other than clobber.
X-Git-Tag: llvmorg-13-init~14576
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a206f8509124c483358eb6e80e08bf621efd7655;p=platform%2Fupstream%2Fllvm.git

[X86] Reject dirflag in inline asm constraints other than clobber.

Fixes the crash from PR47195.
---

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 961fd08..05da599 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -50285,7 +50285,8 @@ X86TargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
       return std::make_pair(X86::EFLAGS, &X86::CCRRegClass);
 
     // dirflag -> DF
-    if (StringRef("{dirflag}").equals_lower(Constraint))
+    // Only allow for clobber.
+    if (StringRef("{dirflag}").equals_lower(Constraint) && VT == MVT::Other)
       return std::make_pair(X86::DF, &X86::DFCCRRegClass);
 
     // fpsr -> FPSW