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8301838: PPC: continuation yield intrinsic: exception check not needed if yield succeeded

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Reviewed-by: lucy, goetz
This commit is contained in:
Richard Reingruber 2023-02-13 13:33:06 +00:00
parent df93880efd
commit 57aef85734
1 changed files with 15 additions and 11 deletions
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26
src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp
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@ -1980,34 +1980,38 @@ static void gen_continuation_yield(MacroAssembler* masm,
Label L_pinned;
__ cmpdi(CCR0, R3_RET, 0);
__ cmpwi(CCR0, R3_RET, 0);
__ bne(CCR0, L_pinned);
// yield succeeded
// Pop frames of continuation including this stub's frame
__ ld_ptr(R1_SP, JavaThread::cont_entry_offset(), R16_thread);
// The frame pushed by gen_continuation_enter is on top now again
continuation_enter_cleanup(masm);
__ bind(L_pinned); // pinned -- return to caller
// Pop frame and return
Label L_return;
__ bind(L_return);
__ pop_frame();
__ ld(R0, _abi0(lr), R1_SP); // Return pc
__ mtlr(R0);
__ blr();
// yield failed - continuation is pinned
__ bind(L_pinned);
// handle pending exception thrown by freeze
Label ok;
__ ld(tmp, in_bytes(JavaThread::pending_exception_offset()), R16_thread);
__ cmpdi(CCR0, tmp, 0);
__ beq(CCR0, ok);
__ beq(CCR0, L_return); // return if no exception is pending
__ pop_frame();
__ ld(R0, _abi0(lr), R1_SP); // Return pc
__ mtlr(R0);
__ load_const_optimized(tmp, StubRoutines::forward_exception_entry(), R0);
__ mtctr(tmp);
__ bctr();
__ bind(ok);
// Pop frame and return
__ pop_frame();
__ ld(R0, _abi0(lr), R1_SP); // Return pc
__ mtlr(R0);
__ blr();
}
// ---------------------------------------------------------------------------