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7063629: use cbcond in C2 generated code on T4

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Use new short branch instruction in C2 generated code.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2011-08-11 12:08:11 -07:00
parent 52f678435a
commit ac99f413d7
20 changed files with 1298 additions and 500 deletions
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10
hotspot/src/cpu/x86/vm/assembler_x86.cpp
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@ -1339,9 +1339,8 @@ void Assembler::incl(Address dst) {
emit_operand(rax, dst);
}
void Assembler::jcc(Condition cc, Label& L, relocInfo::relocType rtype) {
void Assembler::jcc(Condition cc, Label& L, bool maybe_short) {
InstructionMark im(this);
relocate(rtype);
assert((0 <= cc) && (cc < 16), "illegal cc");
if (L.is_bound()) {
address dst = target(L);
@ -1350,7 +1349,7 @@ void Assembler::jcc(Condition cc, Label& L, relocInfo::relocType rtype) {
const int short_size = 2;
const int long_size = 6;
intptr_t offs = (intptr_t)dst - (intptr_t)_code_pos;
if (rtype == relocInfo::none && is8bit(offs - short_size)) {
if (maybe_short && is8bit(offs - short_size)) {
// 0111 tttn #8-bit disp
emit_byte(0x70 | cc);
emit_byte((offs - short_size) & 0xFF);
@ -1399,7 +1398,7 @@ void Assembler::jmp(Address adr) {
emit_operand(rsp, adr);
}
void Assembler::jmp(Label& L, relocInfo::relocType rtype) {
void Assembler::jmp(Label& L, bool maybe_short) {
if (L.is_bound()) {
address entry = target(L);
assert(entry != NULL, "jmp most probably wrong");
@ -1407,7 +1406,7 @@ void Assembler::jmp(Label& L, relocInfo::relocType rtype) {
const int short_size = 2;
const int long_size = 5;
intptr_t offs = entry - _code_pos;
if (rtype == relocInfo::none && is8bit(offs - short_size)) {
if (maybe_short && is8bit(offs - short_size)) {
emit_byte(0xEB);
emit_byte((offs - short_size) & 0xFF);
} else {
@ -1420,7 +1419,6 @@ void Assembler::jmp(Label& L, relocInfo::relocType rtype) {
// the forward jump will not run beyond 256 bytes, use jmpb to
// force an 8-bit displacement.
InstructionMark im(this);
relocate(rtype);
L.add_patch_at(code(), locator());
emit_byte(0xE9);
emit_long(0);