6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-07-08 18:30:04 +00:00
Code Issues Projects Releases Wiki Activity

Verify explicit instruction properties when they can be inferred.

Browse Source 
It is now allowed to explicitly set hasSideEffects, mayStore, and
mayLoad on instructions with patterns.

Verify that the patterns are consistent with the explicit flags.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162569 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-08-24 17:08:41 +00:00
parent b5b86d263a
commit 91f8dc9bae
1 changed files with 39 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
utils/TableGen/CodeGenDAGPatterns.cpp
View File

@ -2457,13 +2457,44 @@ private:
};
static void InferFromPattern(CodeGenInstruction &InstInfo,
static bool InferFromPattern(CodeGenInstruction &InstInfo,
const InstAnalyzer &PatInfo,
Record *PatDef) {
bool Error = false;
// Remember where InstInfo got its flags.
if (InstInfo.hasUndefFlags())
InstInfo.InferredFrom = PatDef;
// Check explicitly set flags for consistency.
if (InstInfo.hasSideEffects != PatInfo.hasSideEffects &&
!InstInfo.hasSideEffects_Unset) {
// Allow explicitly setting hasSideEffects = 1 on instructions, even when
// the pattern has no side effects. That could be useful for div/rem
// instructions that may trap.
if (!InstInfo.hasSideEffects) {
Error = true;
PrintError(PatDef->getLoc(), "Pattern doesn't match hasSideEffects = " +
Twine(InstInfo.hasSideEffects));
}
}
if (InstInfo.mayStore != PatInfo.mayStore && !InstInfo.mayStore_Unset) {
Error = true;
PrintError(PatDef->getLoc(), "Pattern doesn't match mayStore = " +
Twine(InstInfo.mayStore));
}
if (InstInfo.mayLoad != PatInfo.mayLoad && !InstInfo.mayLoad_Unset) {
// Allow explicitly setting mayLoad = 1, even when the pattern has no loads.
// Some targets translate imediates to loads.
if (!InstInfo.mayLoad) {
Error = true;
PrintError(PatDef->getLoc(), "Pattern doesn't match mayLoad = " +
Twine(InstInfo.mayLoad));
}
}
// Transfer inferred flags.
InstInfo.hasSideEffects |= PatInfo.hasSideEffects;
InstInfo.mayStore |= PatInfo.mayStore;
@ -2472,6 +2503,8 @@ static void InferFromPattern(CodeGenInstruction &InstInfo,
// These flags are silently added without any verification.
InstInfo.isBitcast |= PatInfo.isBitcast;
InstInfo.Operands.isVariadic |= PatInfo.isVariadic;
return Error;
}
/// hasNullFragReference - Return true if the DAG has any reference to the
@ -2809,6 +2842,7 @@ void CodeGenDAGPatterns::InferInstructionFlags() {
// First try to infer flags from the primary instruction pattern, if any.
SmallVector<CodeGenInstruction*, 8> Revisit;
unsigned Errors = 0;
for (unsigned i = 0, e = Instructions.size(); i != e; ++i) {
CodeGenInstruction &InstInfo =
const_cast<CodeGenInstruction &>(*Instructions[i]);
@ -2829,9 +2863,12 @@ void CodeGenDAGPatterns::InferInstructionFlags() {
}
InstAnalyzer PatInfo(*this);
PatInfo.Analyze(Pattern);
InferFromPattern(InstInfo, PatInfo, InstInfo.TheDef);
Errors += InferFromPattern(InstInfo, PatInfo, InstInfo.TheDef);
}
if (Errors)
throw "pattern conflicts";
// Revisit instructions with undefined flags and no pattern.
if (Target.guessInstructionProperties()) {
for (unsigned i = 0, e = Revisit.size(); i != e; ++i) {