July 2016 - luajit - lists.linaro.org

by Zhongwei Yao

Hi, all, I run into Segment Fault in: ====== x = 0 for i = 1, 100 do x = tostring(i) end y = "101" ====== And it turns out the JITed code overwrites native stack position at trace head. It can be walked around by set SPS_FIXED to 0. The JITed code is doing register spill and assuming there is "2 fixed spill slots" (defined by SPS_FIXED). But there seems no "fixed spill slots" in arm64 interpreter implementation. Is it true? Could anyone provide some info of aarch64 frame layout? Any input will help! Thanks. -- Best regards, Zhongwei

7 years, 8 months

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Looking for a function to encode from number to immr, imms values for ANDS instruction

by Dikshit, Abhishek

Hi All The immr and imms values are decoded to get an immediate value. Is there a way to encode from immediate value to immr and imms field for ARMv8 ? Instruction [cid:image005.png@01D1E75A.8DE84F20] Routine. [cid:image006.png@01D1E75A.8DE84F20] The DecodeBitMasks routine is not very clear. Any help is appreciated. Abhishek Dikshit

7 years, 8 months

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Looking forward to contribute.

by Dikshit, Abhishek

Hi All, I am looking forward to contribute in development of LuaJIT for ARM64. Please feel free to assign work to me even if it is a minor bug fix. Thanks Abhishek Dikshit

7 years, 9 months

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Finished asm_ahustore

by Stefan Pejic

Hello all, I finished asm_ahustore and submitted a pull request. Apart from asm_ahustore, it contains some additional changes to the interpreter code, that caused me major problems. It enabled a few tests in the current test suite (array, hash and a few more), but it didn't solve everything for upvale tests, which fail because of asm_fuseahuref. I thought to take a look at unimplemented paths of asm_fuseahuref, if that's alright with everybody. Stefan

7 years, 9 months

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LuaJIT tries to convert to floating point

by Dikshit, Abhishek

Hi All I am trying to make this small loop work on ARM64. ./luajit -jon -e 'x=0; for i=1,400000 do x=x+i end;' The code flow reaches the point Unimplemented: asm_conv When I looked into it, it seems that luajit is trying to convert from INT to FLOAT. Any ideas why it might be doing that ? Or is it a bug somewhere I need to look ? Thanks Abhishek Dikshit

7 years, 9 months

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Working on asm_fload

by Djordje Kovacevic

Hi everyone, I have implemented asm_fpmath. The next thing that I'm about to look into is asm_fload, because it seems that there might be a problem for the following example: for i = 1, 100 do io.write('a') end Regards, Djordje -- Đorđe Kovačević Software engineer Phone +381-(0)21-480-1207 djordje.lj.kovacevic(a)rt-rk.com RT-RK Institute for Computer Based Systems Narodnog Fronta 23a 21000 Novi Sad Serbia www.rt-rk.com

7 years, 9 months

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Integer comparisons

by Stefan Pejic

Hello, I ran into an issue with asm_intcomp. Is anyone working on this at the moment? Also, I noticed that enabling assertions in src/Makefile causes some tests failures. And that's happening only after the latest merges. Stefan

7 years, 9 months

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Looks like a minor bug in dis_arm64.lua

by Dikshit, Abhishek

Hi I was trying the -jdump=bitmsr option in ARM64 and I was getting a failure in VM. I made a small modification. Please review and let me know if the modification is correct. ------------------------------------------------------------------------------------ diff --git a/src/jit/dis_arm64.lua b/src/jit/dis_arm64.lua index c1b6201..b39b825 100644 --- a/src/jit/dis_arm64.lua +++ b/src/jit/dis_arm64.lua @@ -1176,8 +1176,8 @@ end -- Return register name for RID. local function regname(r) - if r < 32 then return map_reg.x[r] end - return map_reg.d[r-32] + if r < 32 then return map_regs.x[r] end + return map_regs.d[r-32] end -- Public module functions. ------------------------------------------------------------------------------------- Thanks Abhishek Dikshit

7 years, 9 months

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Array references

by Stefan Pejic

Hello again, I'm planning to work on some examples involving array references, so I will be looking into following functions: - asm_aref - asm_fuseabase - asm_gc_check Stefan

7 years, 9 months

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Working on fpmath

by Djordje Kovacevic

Hi everyone, I have implemented min/max related functions. Now, I'll work on asm_fpmath. Regards, Djordje -- Đorđe Kovačević Software engineer Phone +381-(0)21-480-1207 djordje.lj.kovacevic(a)rt-rk.com RT-RK Institute for Computer Based Systems Narodnog Fronta 23a 21000 Novi Sad Serbia www.rt-rk.com

7 years, 9 months

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luajit July 2016