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Add MachineInstr::isTransient().

Browse Source 
This is a cleaned up version of the isFree() function in
MachineTraceMetrics.cpp.

Transient instructions are very unlikely to produce any code in the
final output. Either because they get eliminated by RegisterCoalescing,
or because they are pseudo-instructions like labels and debug values.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160977 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-07-30 18:34:14 +00:00
parent a1b2bf7979
commit 3f63a58978
2 changed files with 25 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/MachineTraceMetrics.cpp
+1 -23
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@@ -69,28 +69,6 @@ void MachineTraceMetrics::releaseMemory() {
// The number of instructions in a basic block and the CPU resources used by
// those instructions don't depend on any given trace strategy.
/// Is MI an instruction that should be considered free because it will likely
/// be eliminated by later passes?
static bool isFree(const MachineInstr *MI) {
switch(MI->getOpcode()) {
default: return false;
case TargetOpcode::PHI:
case TargetOpcode::PROLOG_LABEL:
case TargetOpcode::EH_LABEL:
case TargetOpcode::GC_LABEL:
case TargetOpcode::KILL:
case TargetOpcode::EXTRACT_SUBREG:
case TargetOpcode::INSERT_SUBREG:
case TargetOpcode::IMPLICIT_DEF:
case TargetOpcode::SUBREG_TO_REG:
case TargetOpcode::COPY_TO_REGCLASS:
case TargetOpcode::DBG_VALUE:
case TargetOpcode::REG_SEQUENCE:
case TargetOpcode::COPY:
return true;
}
}
/// Compute the resource usage in basic block MBB.
const MachineTraceMetrics::FixedBlockInfo*
MachineTraceMetrics::getResources(const MachineBasicBlock *MBB) {
@@ -106,7 +84,7 @@ MachineTraceMetrics::getResources(const MachineBasicBlock *MBB) {
for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
const MachineInstr *MI = I;
if (isFree(MI))
if (MI->isTransient())
continue;
++InstrCount;
if (MI->isCall())