Hi all,

I'm trying to figure out how to add the instructions required for llvm.atomic.cmp.swap.i32 on PowerPC. I figured out LWARX (patch attached) but the other two (CMP_UNRESw and STWCX) require multiple instructions:

let Defs = [CR0] in { def STWCX : Pseudo<(outs), (ins GPRC:$rS, memrr:$dst, i32imm:$label), "stwcx. $rS, $dst\n\tbne-
La${label}_entry\nLa${label}_exit:", [(PPCstcx GPRC:$rS, xoaddr:$dst, imm:$label)]>;

def CMP_UNRESw : Pseudo<(outs), (ins GPRC:$rA, GPRC:$rB, i32imm:$label), "cmpw $rA, $rB\n\tbne- La${label}_exit", [(PPCcmp_unres GPRC:$rA, GPRC:$rB, imm:$label)]>; }

...and I can't figure out the syntax for that. Any suggestions?

Cheers, Gary

-- http://gbenson.net/

Index: lib/Target/PowerPC/PPCInstrInfo.td =================================================================== --- lib/Target/PowerPC/PPCInstrInfo.td (revision 52823) +++ lib/Target/PowerPC/PPCInstrInfo.td (working copy) @@ -531,8 +531,8 @@ PPC970_DGroup_Single;

// Atomic operations. -def LWARX : Pseudo<(outs GPRC:$rD), (ins memrr:$ptr, i32imm:$label), - "\nLa${label}_entry:\n\tlwarx $rD, $ptr", +def LWARX : XForm_1<31, 20, (outs GPRC:$rD), (ins memrr:$ptr, i32imm:$label), + "\nLa${label}_entry:\n\tlwarx $rD, $ptr", LdStLWARX, [(set GPRC:$rD, (PPClarx xoaddr:$ptr, imm:$label))]>;

let Defs = [CR0] in {