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2010 Sep 10
0
[LLVMdev] Problem with a target-specific builtin definition
...nstruction takes just the syscall number as immediate. It returns one
int value in a register specified in the ABI for return values.
So I have defined this instruction in InstrInfo.td as follows:
def SCALL : Instr_Calls<(outs), (ins i32imm:$a),
"scall $a", [(int_mt_scall sysnumber:$a)]>;
The problem is with defining the intrinsic. If I define it in Clang (and
with similar types in LLVM) as follows:
BUILTIN(__builtin_mt_scall, "vi", "")
I cannot use the return value in C code:
if ( __builtin_mt_scall(127) == 0 ) do_something();
If I set the return...