Basic support for regparm codegen
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68414 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index 19f66b1..e3f824f 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -1646,6 +1646,7 @@
unsigned FuncAttrs = 0;
unsigned RetAttrs = 0;
+ // FIXME: handle sseregparm someday...
if (TargetDecl) {
if (TargetDecl->getAttr<NoThrowAttr>())
FuncAttrs |= llvm::Attribute::NoUnwind;
@@ -1691,19 +1692,29 @@
if (RetAttrs)
PAL.push_back(llvm::AttributeWithIndex::get(0, RetAttrs));
+
+ // FIXME: we need to honour command line settings also...
+ // FIXME: RegParm should be reduced in case of nested functions and/or global
+ // register variable.
+ signed RegParm = 0;
+ if (TargetDecl)
+ if (const RegparmAttr *RegParmAttr = TargetDecl->getAttr<RegparmAttr>())
+ RegParm = RegParmAttr->getNumParams();
+
+ unsigned PointerWidth = getContext().Target.getPointerWidth(0);
for (CGFunctionInfo::const_arg_iterator it = FI.arg_begin(),
ie = FI.arg_end(); it != ie; ++it) {
QualType ParamType = it->type;
const ABIArgInfo &AI = it->info;
unsigned Attributes = 0;
-
+
switch (AI.getKind()) {
case ABIArgInfo::Coerce:
break;
case ABIArgInfo::Indirect:
Attributes |= llvm::Attribute::ByVal;
- Attributes |=
+ Attributes |=
llvm::Attribute::constructAlignmentFromInt(AI.getIndirectAlign());
// byval disables readnone and readonly.
FuncAttrs &= ~(llvm::Attribute::ReadOnly |
@@ -1718,8 +1729,16 @@
Attributes |= llvm::Attribute::ZExt;
}
}
+ if (RegParm > 0 &&
+ (ParamType->isIntegerType() || ParamType->isPointerType())) {
+ RegParm -=
+ (Context.getTypeSize(ParamType) + PointerWidth - 1) / PointerWidth;
+ if (RegParm >= 0)
+ Attributes |= llvm::Attribute::InReg;
+ }
+ // FIXME: handle sseregparm someday...
break;
-
+
case ABIArgInfo::Ignore:
// Skip increment, no matching LLVM parameter.
continue;