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Code Issues Projects Releases Wiki Activity

Aligned bundling support. Following the discussion here:

Browse Source 
http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-December/056754.html

The proposal and implementation are fully documented here:
https://sites.google.com/a/chromium.org/dev/nativeclient/pnacl/aligned-bundling-support-in-llvm

Tests will follow shortly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170718 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Bendersky
2012-12-20 19:05:53 +00:00
parent 5d3cfa6d1f
commit 4766ef41b3
12 changed files with 393 additions and 19 deletions
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33
lib/MC/MCObjectStreamer.cpp
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@@ -180,21 +180,27 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
if (Inst.getOperand(i).isExpr())
AddValueSymbols(Inst.getOperand(i).getExpr());
getCurrentSectionData()->setHasInstructions(true);
MCSectionData *SD = getCurrentSectionData();
SD->setHasInstructions(true);
// Now that a machine instruction has been assembled into this section, make
// a line entry for any .loc directive that has been seen.
MCLineEntry::Make(this, getCurrentSection());
// If this instruction doesn't need relaxation, just emit it as data.
if (!getAssembler().getBackend().mayNeedRelaxation(Inst)) {
MCAssembler &Assembler = getAssembler();
if (!Assembler.getBackend().mayNeedRelaxation(Inst)) {
EmitInstToData(Inst);
return;
}
// Otherwise, if we are relaxing everything, relax the instruction as much as
// possible and emit it as data.
if (getAssembler().getRelaxAll()) {
// Otherwise, relax and emit it as data if either:
// - The RelaxAll flag was passed
// - Bundling is enabled and this instruction is inside a bundle-locked
// group. We want to emit all such instructions into the same data
// fragment.
if (Assembler.getRelaxAll() ||
(Assembler.isBundlingEnabled() && SD->isBundleLocked())) {
MCInst Relaxed;
getAssembler().getBackend().relaxInstruction(Inst, Relaxed);
while (getAssembler().getBackend().mayNeedRelaxation(Relaxed))
@@ -208,6 +214,8 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
}
void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
// Always create a new, separate fragment here, because its size can change
// during relaxation.
MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
SmallString<128> Code;
@@ -217,6 +225,21 @@ void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
IF->getContents().append(Code.begin(), Code.end());
}
const char *BundlingNotImplementedMsg =
"Aligned bundling is not implemented for this object format";
void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
llvm_unreachable(BundlingNotImplementedMsg);
}
void MCObjectStreamer::EmitBundleLock() {
llvm_unreachable(BundlingNotImplementedMsg);
}
void MCObjectStreamer::EmitBundleUnlock() {
llvm_unreachable(BundlingNotImplementedMsg);
}
void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
const MCSymbol *LastLabel,
const MCSymbol *Label,