From 710c1a449dd7bee747ecf9c344a6f6d5461a158d Mon Sep 17 00:00:00 2001 From: Reid Kleckner Date: Thu, 24 Apr 2014 20:14:34 +0000 Subject: Add 'musttail' marker to call instructions This is similar to the 'tail' marker, except that it guarantees that tail call optimization will occur. It also comes with convervative IR verification rules that ensure that tail call optimization is possible. Reviewers: nicholas Differential Revision: http://llvm-reviews.chandlerc.com/D3240 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207143 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Bitcode/Writer/BitcodeWriter.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'lib/Bitcode/Writer') diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp index 62dba41460..92965fa7e4 100644 --- a/lib/Bitcode/Writer/BitcodeWriter.cpp +++ b/lib/Bitcode/Writer/BitcodeWriter.cpp @@ -1469,7 +1469,8 @@ static void WriteInstruction(const Instruction &I, unsigned InstID, Code = bitc::FUNC_CODE_INST_CALL; Vals.push_back(VE.getAttributeID(CI.getAttributes())); - Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall())); + Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()) | + unsigned(CI.isMustTailCall()) << 14); PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee // Emit value #'s for the fixed parameters. -- cgit v1.2.3