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TableGen: Support folding casts from bits to int

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This is to fix an incorrect error when trying to initialize
DwarfNumbers with a !cast<int> of a bits initializer.
getValuesAsListOfInts("DwarfNumbers") would not see an IntInit
and instead the cast, so would give up.

It seems likely that this could be generalized to attempt
the convertInitializerTo for any type. I'm not really sure
why the existing code seems to special case the string cast cases
when convertInitializerTo seems like it should generally handle this
sort of thing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243722 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2015-07-31 01:12:06 +00:00
parent a29a752cf5
commit 6a224c30a5
2 changed files with 18 additions and 0 deletions
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8
lib/TableGen/Record.cpp
View File

@ -673,6 +673,14 @@ Init *UnOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
PrintFatalError(CurRec->getLoc(),
"Undefined reference:'" + Name + "'\n");
}
if (isa<IntRecTy>(getType())) {
if (BitsInit *BI = dyn_cast<BitsInit>(LHS)) {
if (Init *NewInit = BI->convertInitializerTo(IntRecTy::get()))
return NewInit;
break;
}
}
}
break;
}

10
test/TableGen/cast-list-initializer.td Normal file
View File

@ -0,0 +1,10 @@
// RUN: llvm-tblgen %s | FileCheck %s
class Foo<bits<8> b> {
// CHECK: list<int> ListOfInts = [170];
// CHECK: list<int> AnotherList = [170, 7];
list<int> ListOfInts = [!cast<int>(b)];
list<int> AnotherList = [!cast<int>(b), !cast<int>({1, 1, 1})];
}
def : Foo<{1, 0, 1, 0, 1, 0, 1, 0}>;