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, 2 insertions, 4 deletions

diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
index f2f11c19251..c735efab9c1 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -414,10 +414,8 @@ ValueEnumerator::ValueEnumerator(const Module &M,
           EnumerateMetadata(&F, MD->getMetadata());
         }
         EnumerateType(I.getType());
-        if (const CallInst *CI = dyn_cast<CallInst>(&I))
-          EnumerateAttributes(CI->getAttributes());
-        else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I))
-          EnumerateAttributes(II->getAttributes());
+        if (const auto *Call = dyn_cast<CallBase>(&I))
+          EnumerateAttributes(Call->getAttributes());
 
         // Enumerate metadata attached with this instruction.
         MDs.clear();