diff options
Diffstat (limited to 'clang/lib/CodeGen/CGStmt.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CGStmt.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp index 0d41055bf7e..8e1c7f2d197 100644 --- a/clang/lib/CodeGen/CGStmt.cpp +++ b/clang/lib/CodeGen/CGStmt.cpp @@ -1696,7 +1696,7 @@ SimplifyConstraint(const char *Constraint, const TargetInfo &Target, static std::string AddVariableConstraints(const std::string &Constraint, const Expr &AsmExpr, const TargetInfo &Target, CodeGenModule &CGM, - const AsmStmt &Stmt) { + const AsmStmt &Stmt, const bool EarlyClobber) { const DeclRefExpr *AsmDeclRef = dyn_cast<DeclRefExpr>(&AsmExpr); if (!AsmDeclRef) return Constraint; @@ -1721,7 +1721,7 @@ AddVariableConstraints(const std::string &Constraint, const Expr &AsmExpr, } // Canonicalize the register here before returning it. Register = Target.getNormalizedGCCRegisterName(Register); - return "{" + Register.str() + "}"; + return (EarlyClobber ? "&{" : "{") + Register.str() + "}"; } llvm::Value* @@ -1854,7 +1854,8 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) { OutExpr = OutExpr->IgnoreParenNoopCasts(getContext()); OutputConstraint = AddVariableConstraints(OutputConstraint, *OutExpr, - getTarget(), CGM, S); + getTarget(), CGM, S, + Info.earlyClobber()); LValue Dest = EmitLValue(OutExpr); if (!Constraints.empty()) @@ -1959,7 +1960,7 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) { InputConstraint = AddVariableConstraints(InputConstraint, *InputExpr->IgnoreParenNoopCasts(getContext()), - getTarget(), CGM, S); + getTarget(), CGM, S, Info.earlyClobber()); llvm::Value *Arg = EmitAsmInput(Info, InputExpr, Constraints); |
