[Sparc] Add support for inline assembly constraints which specify registers by their aliases.
llvm-svn: 199786
diff --git a/llvm/lib/Target/Sparc/SparcISelLowering.cpp b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
index 6dae29c..a1b879b 100644
--- a/llvm/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
@@ -2997,6 +2997,26 @@
case 'r':
return std::make_pair(0U, &SP::IntRegsRegClass);
}
+ } else if (!Constraint.empty() && Constraint.size() <= 5
+ && Constraint[0] == '{' && *(Constraint.end()-1) == '}') {
+ // constraint = '{r<d>}'
+ // Remove the braces from around the name.
+ StringRef name(Constraint.data()+1, Constraint.size()-2);
+ // Handle register aliases:
+ // r0-r7 -> g0-g7
+ // r8-r15 -> o0-o7
+ // r16-r23 -> l0-l7
+ // r24-r31 -> i0-i7
+ uint64_t intVal = 0;
+ if (name.substr(0, 1).equals("r")
+ && !name.substr(1).getAsInteger(10, intVal) && intVal <= 31) {
+ const char regTypes[] = { 'g', 'o', 'l', 'i' };
+ char regType = regTypes[intVal/8];
+ char regIdx = '0' + (intVal % 8);
+ char tmp[] = { '{', regType, regIdx, '}', 0 };
+ std::string newConstraint = std::string(tmp);
+ return TargetLowering::getRegForInlineAsmConstraint(newConstraint, VT);
+ }
}
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);