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8131682: C1 should use multibyte nops everywhere

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Reviewed-by: dlong, goetz, adinn, aph, vlivanov
This commit is contained in:
Aleksey Shipilev 2015-08-11 12:24:26 +03:00
parent 645a55a98f
commit f6c7ab6565
5 changed files with 16 additions and 17 deletions
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8
hotspot/src/share/vm/c1/c1_LIRAssembler.cpp
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@ -33,7 +33,9 @@
#include "runtime/os.hpp"
void LIR_Assembler::patching_epilog(PatchingStub* patch, LIR_PatchCode patch_code, Register obj, CodeEmitInfo* info) {
// we must have enough patching space so that call can be inserted
// We must have enough patching space so that call can be inserted.
// We cannot use fat nops here, since the concurrent code rewrite may transiently
// create the illegal instruction sequence.
while ((intx) _masm->pc() - (intx) patch->pc_start() < NativeCall::instruction_size) {
_masm->nop();
}
@ -592,9 +594,7 @@ void LIR_Assembler::emit_op1(LIR_Op1* op) {
void LIR_Assembler::emit_op0(LIR_Op0* op) {
switch (op->code()) {
case lir_word_align: {
while (code_offset() % BytesPerWord != 0) {
_masm->nop();
}
_masm->align(BytesPerWord);
break;
}