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Factor out FastISel's code for materializing constants and other values

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in registers into a separate function to de-couple it from the
top-down-specific logic in getRegForValue.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102975 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-05-03 23:36:34 +00:00
parent 08673d2950
commit 1fdc614bee
2 changed files with 15 additions and 1 deletions
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5
include/llvm/CodeGen/FastISel.h
View File

@ -311,6 +311,11 @@ private:
/// might result in multiple MBB's for one BB. As such, the start of the
/// BB might correspond to a different MBB than the end.
bool HandlePHINodesInSuccessorBlocks(const BasicBlock *LLVMBB);
/// materializeRegForValue - Helper for getRegForVale. This function is
/// called when the value isn't already available in a register and must
/// be materialized with new instructions.
unsigned materializeRegForValue(const Value *V, MVT VT);
};
}

11
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -84,6 +84,15 @@ unsigned FastISel::getRegForValue(const Value *V) {
if (Reg != 0)
return Reg;
return materializeRegForValue(V, VT);
}
/// materializeRegForValue - Helper for getRegForVale. This function is
/// called when the value isn't already available in a register and must
/// be materialized with new instructions.
unsigned FastISel::materializeRegForValue(const Value *V, MVT VT) {
unsigned Reg = 0;
if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
if (CI->getValue().getActiveBits() <= 64)
Reg = FastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
@ -141,7 +150,7 @@ unsigned FastISel::lookUpRegForValue(const Value *V) {
// Look up the value to see if we already have a register for it. We
// cache values defined by Instructions across blocks, and other values
// only locally. This is because Instructions already have the SSA
// def-dominatess-use requirement enforced.
// def-dominates-use requirement enforced.
if (ValueMap.count(V))
return ValueMap[V];
return LocalValueMap[V];