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Implementation of asm-goto support in LLVM

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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
This commit is contained in:
Craig Topper
2019-02-08 20:48:56 +00:00
parent 1ffce06c6d
commit ea7e6b3857
87 changed files with 1811 additions and 218 deletions
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lib/Bitcode/Writer/ValueEnumerator.cpp
+2 -4
View File
@@ -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();