1.1 --- a/src/cpu/x86/vm/x86_32.ad Sun Dec 23 17:08:22 2012 +0100
1.2 +++ b/src/cpu/x86/vm/x86_32.ad Thu Jan 03 15:09:55 2013 -0800
1.3 @@ -11572,15 +11572,28 @@
1.4 // =======================================================================
1.5 // fast clearing of an array
1.6 instruct rep_stos(eCXRegI cnt, eDIRegP base, eAXRegI zero, Universe dummy, eFlagsReg cr) %{
1.7 + predicate(!UseFastStosb);
1.8 match(Set dummy (ClearArray cnt base));
1.9 effect(USE_KILL cnt, USE_KILL base, KILL zero, KILL cr);
1.10 - format %{ "SHL ECX,1\t# Convert doublewords to words\n\t"
1.11 - "XOR EAX,EAX\n\t"
1.12 + format %{ "XOR EAX,EAX\t# ClearArray:\n\t"
1.13 + "SHL ECX,1\t# Convert doublewords to words\n\t"
1.14 "REP STOS\t# store EAX into [EDI++] while ECX--" %}
1.15 - opcode(0,0x4);
1.16 - ins_encode( Opcode(0xD1), RegOpc(ECX),
1.17 - OpcRegReg(0x33,EAX,EAX),
1.18 - Opcode(0xF3), Opcode(0xAB) );
1.19 + ins_encode %{
1.20 + __ clear_mem($base$$Register, $cnt$$Register, $zero$$Register);
1.21 + %}
1.22 + ins_pipe( pipe_slow );
1.23 +%}
1.24 +
1.25 +instruct rep_fast_stosb(eCXRegI cnt, eDIRegP base, eAXRegI zero, Universe dummy, eFlagsReg cr) %{
1.26 + predicate(UseFastStosb);
1.27 + match(Set dummy (ClearArray cnt base));
1.28 + effect(USE_KILL cnt, USE_KILL base, KILL zero, KILL cr);
1.29 + format %{ "XOR EAX,EAX\t# ClearArray:\n\t"
1.30 + "SHL ECX,3\t# Convert doublewords to bytes\n\t"
1.31 + "REP STOSB\t# store EAX into [EDI++] while ECX--" %}
1.32 + ins_encode %{
1.33 + __ clear_mem($base$$Register, $cnt$$Register, $zero$$Register);
1.34 + %}
1.35 ins_pipe( pipe_slow );
1.36 %}
1.37
