[llvm] a206f85 - [X86] Reject dirflag in inline asm constraints other than clobber.

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2020-08-16T23:33:45-07:00
New Revision: a206f8509124c483358eb6e80e08bf621efd7655

URL: https://github.com/llvm/llvm-project/commit/a206f8509124c483358eb6e80e08bf621efd7655
DIFF: https://github.com/llvm/llvm-project/commit/a206f8509124c483358eb6e80e08bf621efd7655.diff

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

Fixes the crash from PR47195.

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86ISelLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 961fd08858b4..05da59983677 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