Implementation of asm-goto support in LLVM

This patch accompanies the RFC posted here:
http://lists.llvm.org/pipermail/llvm-dev/2018-October/127239.html

This patch adds a new CallBr IR instruction to support asm-goto
inline assembly like gcc as used by the linux kernel. This
instruction is both a call instruction and a terminator
instruction with multiple successors. Only inline assembly
usage is supported today.

This also adds a new INLINEASM_BR opcode to SelectionDAG and
MachineIR to represent an INLINEASM block that is also
considered a terminator instruction.

There will likely be more bug fixes and optimizations to follow
this, but we felt it had reached a point where we would like to
switch to an incremental development model.

Patch by Craig Topper, Alexander Ivchenko, Mikhail Dvoretckii

Differential Revision: https://reviews.llvm.org/D53765

llvm-svn: 353563

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/AsmParser/LLParser.h b/llvm/lib/AsmParser/LLParser.h
index d8efbb1cf10..95aea0c775a 100644
--- a/llvm/lib/AsmParser/LLParser.h
+++ b/llvm/lib/AsmParser/LLParser.h
@@ -570,6 +570,7 @@ namespace llvm {
     bool ParseCatchSwitch(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseCatchPad(Instruction *&Inst, PerFunctionState &PFS);
     bool ParseCleanupPad(Instruction *&Inst, PerFunctionState &PFS);
+    bool ParseCallBr(Instruction *&Inst, PerFunctionState &PFS);
 
     bool ParseUnaryOp(Instruction *&Inst, PerFunctionState &PFS, unsigned Opc,
                       unsigned OperandType);