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8359386: Fix incorrect value for max_size of C2CodeStub when APX is used #25787

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8359386: Fix incorrect value for max_size of C2CodeStub when APX is used #25787

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0eca30d
8359386: Fix incorrect value for max_size of C2CodeStub when APX is used
vamsi-parasa Jun 12, 2025
37dede6
update max_size computation to be explicit
vamsi-parasa Jun 16, 2025
4fe56be
Fix the change in the stub size by 1 byte
vamsi-parasa Jun 17, 2025
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5 changes: 4 additions & 1 deletion src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4655,6 +4655,7 @@ static void convertF2I_slowpath(C2_MacroAssembler& masm, C2GeneralStub<Register,
__ subptr(rsp, 8);
__ movdbl(Address(rsp), src);
__ call(RuntimeAddress(target));
// APX REX2 encoding for pop(dst) increases the stub size by 1 byte.
__ pop(dst);
__ jmp(stub.continuation());
#undef __
Expand Down Expand Up @@ -4687,7 +4688,9 @@ void C2_MacroAssembler::convertF2I(BasicType dst_bt, BasicType src_bt, Register
}
}

auto stub = C2CodeStub::make<Register, XMMRegister, address>(dst, src, slowpath_target, 23, convertF2I_slowpath);
// Using the APX extended general purpose registers increases the instruction encoding size by 1 byte.
int max_size = 23 + (UseAPX ? 1 : 0);
auto stub = C2CodeStub::make<Register, XMMRegister, address>(dst, src, slowpath_target, max_size, convertF2I_slowpath);
jcc(Assembler::equal, stub->entry());
bind(stub->continuation());
}
Expand Down