On 09/17/2018 07:00 PM, Vladimir Kozlov wrote:
> On 9/17/18 9:20 AM, Bob Vandette wrote:
>> Please review the changes related to JEP 340 which remove the second
>> 64-bit ARM port from the JDK.>>
>> http://cr.openjdk.java.net/~bobv/8209093/webrev.01
I read through the webrev, and it seems to be the clean removal. It also feels
very satisfying to drop 15 KLOC of ifdef-ed code.
Minor nits:
*) In src/hotspot/cpu/arm/c1_LIRAssembler_arm.cpp and
src/hotspot/cpu/arm/interp_masm_arm.cpp we have "#if defined(ASSERT)", which cab
be just "#ifdef ASSERT" now
*) Ditto in src/hotspot/cpu/arm/jniFastGetField_arm.cpp we have "#if
defined(__ABI_HARD__)"
*) In src/hotspot/cpu/arm/macroAssembler_arm.hpp, the comment below seems to
apply to AArch64 only. Yet, only the first line of the comment is removed. I
think we should instead convert that comment into "TODO:" mentioning this might
be revised after AArch64 removal?
992 void branch_if_negative_32(Register r, Label& L) {
993 // Note about branch_if_negative_32() / branch_if_any_negative_32()
implementation for AArch64:
994 // tbnz is not used instead of tst & b.mi because destination may be
out of tbnz range (+-32KB)
995 // since these methods are used in LIR_Assembler::emit_arraycopy() to
jump to stub entry.
996 tst_32(r, r);
997 b(L, mi);
998 }
*) In src/hotspot/cpu/arm/stubGenerator_arm.cpp, lines L1204..1205, L1435..1436
can be merged together:
1203 // Generate the inner loop for shifted forward array copy (unaligned
copy).
1204 // It can be used when bytes_per_count < wordSize, i.e.
1205 // byte/short copy
1434 // Generate the inner loop for shifted backward array copy (unaligned
copy).
1435 // It can be used when bytes_per_count < wordSize, i.e.
1436 // byte/short copy
*) In src/hotspot/cpu/arm/stubGenerator_arm.cpp, the comment changed
incorrectly around L3363?
- // R4 (AArch64) / SP[0] (32-bit ARM) - element count (32-bit int)
+ // R4 - element count (32-bit int)
*) In src/hotspot/cpu/arm/templateInterpreterGenerator_arm.cpp, "R4"/"R5"
comments are missing:
- const Register Rsig_handler = AARCH64_ONLY(R21) NOT_AARCH64(Rtmp_save0 /*
R4 */);
- const Register Rnative_code = AARCH64_ONLY(R22) NOT_AARCH64(Rtmp_save1 /*
R5 */);
+ const Register Rsig_handler = Rtmp_save0;
+ const Register Rnative_code = Rtmp_save1;
Thanks,
-Aleksey
