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-rw-r--r--llvm/lib/Transforms/IPO/MergeFunctions.cpp96
1 files changed, 79 insertions, 17 deletions
diff --git a/llvm/lib/Transforms/IPO/MergeFunctions.cpp b/llvm/lib/Transforms/IPO/MergeFunctions.cpp
index 9ffd653..5b71985 100644
--- a/llvm/lib/Transforms/IPO/MergeFunctions.cpp
+++ b/llvm/lib/Transforms/IPO/MergeFunctions.cpp
@@ -397,12 +397,12 @@ private:
int cmpTypes(Type *TyL, Type *TyR) const;
int cmpNumbers(uint64_t L, uint64_t R) const;
-
int cmpAPInts(const APInt &L, const APInt &R) const;
int cmpAPFloats(const APFloat &L, const APFloat &R) const;
int cmpInlineAsm(const InlineAsm *L, const InlineAsm *R) const;
int cmpMem(StringRef L, StringRef R) const;
int cmpAttrs(const AttributeSet L, const AttributeSet R) const;
+ int cmpRangeMetadata(const MDNode* L, const MDNode* R) const;
// The two functions undergoing comparison.
const Function *FnL, *FnR;
@@ -481,13 +481,21 @@ int FunctionComparator::cmpAPInts(const APInt &L, const APInt &R) const {
}
int FunctionComparator::cmpAPFloats(const APFloat &L, const APFloat &R) const {
- // TODO: This correctly handles all existing fltSemantics, because they all
- // have different precisions. This isn't very robust, however, if new types
- // with different exponent ranges are introduced.
+ // Floats are ordered first by semantics (i.e. float, double, half, etc.),
+ // then by value interpreted as a bitstring (aka APInt).
const fltSemantics &SL = L.getSemantics(), &SR = R.getSemantics();
if (int Res = cmpNumbers(APFloat::semanticsPrecision(SL),
APFloat::semanticsPrecision(SR)))
return Res;
+ if (int Res = cmpNumbers(APFloat::semanticsMaxExponent(SL),
+ APFloat::semanticsMaxExponent(SR)))
+ return Res;
+ if (int Res = cmpNumbers(APFloat::semanticsMinExponent(SL),
+ APFloat::semanticsMinExponent(SR)))
+ return Res;
+ if (int Res = cmpNumbers(APFloat::semanticsSizeInBits(SL),
+ APFloat::semanticsSizeInBits(SR)))
+ return Res;
return cmpAPInts(L.bitcastToAPInt(), R.bitcastToAPInt());
}
@@ -524,6 +532,32 @@ int FunctionComparator::cmpAttrs(const AttributeSet L,
}
return 0;
}
+int FunctionComparator::cmpRangeMetadata(const MDNode* L,
+ const MDNode* R) const {
+ if (L == R)
+ return 0;
+ if (!L)
+ return -1;
+ if (!R)
+ return 1;
+ // Range metadata is a sequence of numbers. Make sure they are the same
+ // sequence.
+ // TODO: Note that as this is metadata, it is possible to drop and/or merge
+ // this data when considering functions to merge. Thus this comparison would
+ // return 0 (i.e. equivalent), but merging would become more complicated
+ // because the ranges would need to be unioned. It is not likely that
+ // functions differ ONLY in this metadata if they are actually the same
+ // function semantically.
+ if (int Res = cmpNumbers(L->getNumOperands(), R->getNumOperands()))
+ return Res;
+ for (size_t I = 0; I < L->getNumOperands(); ++I) {
+ ConstantInt* LLow = mdconst::extract<ConstantInt>(L->getOperand(I));
+ ConstantInt* RLow = mdconst::extract<ConstantInt>(R->getOperand(I));
+ if (int Res = cmpAPInts(LLow->getValue(), RLow->getValue()))
+ return Res;
+ }
+ return 0;
+}
/// Constants comparison:
/// 1. Check whether type of L constant could be losslessly bitcasted to R
@@ -607,7 +641,7 @@ int FunctionComparator::cmpConstants(const Constant *L, const Constant *R) {
return Res;
if (const auto *SeqL = dyn_cast<ConstantDataSequential>(L)) {
- const auto *SeqR = dyn_cast<ConstantDataSequential>(R);
+ const auto *SeqR = cast<ConstantDataSequential>(R);
// This handles ConstantDataArray and ConstantDataVector. Note that we
// compare the two raw data arrays, which might differ depending on the host
// endianness. This isn't a problem though, because the endiness of a module
@@ -685,10 +719,38 @@ int FunctionComparator::cmpConstants(const Constant *L, const Constant *R) {
return 0;
}
case Value::BlockAddressVal: {
- // FIXME: This still uses a pointer comparison. It isn't clear how to remove
- // this. This only affects programs which take BlockAddresses and store them
- // as constants, which is limited to interepreters, etc.
- return cmpNumbers((uint64_t)L, (uint64_t)R);
+ const BlockAddress *LBA = cast<BlockAddress>(L);
+ const BlockAddress *RBA = cast<BlockAddress>(R);
+ if (int Res = cmpValues(LBA->getFunction(), RBA->getFunction()))
+ return Res;
+ if (LBA->getFunction() == RBA->getFunction()) {
+ // They are BBs in the same function. Order by which comes first in the
+ // BB order of the function. This order is deterministic.
+ Function* F = LBA->getFunction();
+ BasicBlock *LBB = LBA->getBasicBlock();
+ BasicBlock *RBB = RBA->getBasicBlock();
+ if (LBB == RBB)
+ return 0;
+ for(BasicBlock &BB : F->getBasicBlockList()) {
+ if (&BB == LBB) {
+ assert(&BB != RBB);
+ return -1;
+ }
+ if (&BB == RBB)
+ return 1;
+ }
+ llvm_unreachable("Basic Block Address does not point to a basic block in "
+ "its function.");
+ return -1;
+ } else {
+ // cmpValues said the functions are the same. So because they aren't
+ // literally the same pointer, they must respectively be the left and
+ // right functions.
+ assert(LBA->getFunction() == FnL && RBA->getFunction() == FnR);
+ // cmpValues will tell us if these are equivalent BasicBlocks, in the
+ // context of their respective functions.
+ return cmpValues(LBA->getBasicBlock(), RBA->getBasicBlock());
+ }
}
default: // Unknown constant, abort.
DEBUG(dbgs() << "Looking at valueID " << L->getValueID() << "\n");
@@ -849,8 +911,8 @@ int FunctionComparator::cmpOperations(const Instruction *L,
if (int Res =
cmpNumbers(LI->getSynchScope(), cast<LoadInst>(R)->getSynchScope()))
return Res;
- return cmpNumbers((uint64_t)LI->getMetadata(LLVMContext::MD_range),
- (uint64_t)cast<LoadInst>(R)->getMetadata(LLVMContext::MD_range));
+ return cmpRangeMetadata(LI->getMetadata(LLVMContext::MD_range),
+ cast<LoadInst>(R)->getMetadata(LLVMContext::MD_range));
}
if (const StoreInst *SI = dyn_cast<StoreInst>(L)) {
if (int Res =
@@ -873,9 +935,9 @@ int FunctionComparator::cmpOperations(const Instruction *L,
if (int Res =
cmpAttrs(CI->getAttributes(), cast<CallInst>(R)->getAttributes()))
return Res;
- return cmpNumbers(
- (uint64_t)CI->getMetadata(LLVMContext::MD_range),
- (uint64_t)cast<CallInst>(R)->getMetadata(LLVMContext::MD_range));
+ return cmpRangeMetadata(
+ CI->getMetadata(LLVMContext::MD_range),
+ cast<CallInst>(R)->getMetadata(LLVMContext::MD_range));
}
if (const InvokeInst *CI = dyn_cast<InvokeInst>(L)) {
if (int Res = cmpNumbers(CI->getCallingConv(),
@@ -884,9 +946,9 @@ int FunctionComparator::cmpOperations(const Instruction *L,
if (int Res =
cmpAttrs(CI->getAttributes(), cast<InvokeInst>(R)->getAttributes()))
return Res;
- return cmpNumbers(
- (uint64_t)CI->getMetadata(LLVMContext::MD_range),
- (uint64_t)cast<InvokeInst>(R)->getMetadata(LLVMContext::MD_range));
+ return cmpRangeMetadata(
+ CI->getMetadata(LLVMContext::MD_range),
+ cast<InvokeInst>(R)->getMetadata(LLVMContext::MD_range));
}
if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(L)) {
ArrayRef<unsigned> LIndices = IVI->getIndices();
generated by cgit v1.1 at 2025-10-15 12:47:58 +0000