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x86 review fixes

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This commit is contained in:
Andrew Haley 2026-07-16 12:41:32 +01:00
parent 4abb7eb5c2
commit 6ef1086533
1 changed files with 21 additions and 0 deletions
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21
src/hotspot/cpu/x86/c1_MacroAssembler_x86.cpp
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@ -272,6 +272,13 @@ void C1_MacroAssembler::step_random(Register state, Register temp) {
// One of these will be the best for a particular CPU.
if (VM_Version::supports_sse4_2()) {
#ifndef PRODUCT
Label not_zero;
orl(r_profile_rng, r_profile_rng);
jcc(Assembler::notZero, not_zero);
stop("non-zero required before step");
bind(not_zero);
#endif
/* CRC used as a pseudo-random-number generator */
// In effect, the CRC instruction is being used here for its
// linear feedback shift register.
@ -288,6 +295,13 @@ void C1_MacroAssembler::step_random(Register state, Register temp) {
void C1_MacroAssembler::save_profile_rng() {
if (ProfileCaptureRatio > 1) {
#ifndef PRODUCT
Label not_zero;
orl(r_profile_rng, r_profile_rng);
jcc(Assembler::notZero, not_zero);
stop("non-zero required before save");
bind(not_zero);
#endif
movl(Address(r15_thread, JavaThread::profile_rng_offset()), r_profile_rng);
}
}
@ -295,6 +309,13 @@ void C1_MacroAssembler::save_profile_rng() {
void C1_MacroAssembler::restore_profile_rng() {
if (ProfileCaptureRatio > 1) {
movl(r_profile_rng, Address(r15_thread, JavaThread::profile_rng_offset()));
#ifndef PRODUCT
Label not_zero;
orl(r_profile_rng, r_profile_rng);
jcc(Assembler::notZero, not_zero);
stop("non-zero required after restore");
bind(not_zero);
#endif
}
}