similar to: Issue with __attribute__((constructor)) and -Os -fno-common

On 6/11/20 11:25 PM, James Y Knight wrote: > The global constructor was removed by setting the initial value of "val" to > 1 instead of 0. So, the behavior of this program is preserved. Doesn't look > like erroneous behavior. OK, my example is too simplified indeed. Please consider the following instead: int val; static void __attribute__((constructor)) init_fn(void) {

Hi, I experienced a crash in code compiled with Clang 10.0.0 due to a misaligned 64-bit data access. The (ARMv8) CPU is configured with SCTL.A == 1 (alignment check enable). With SCTLR.A == 0 the code runs as expected. After some investigation I came up with the following reproducer: ---8<-------8<-------8<-------8<-------8<-------8<-------8<------- $ cat test.c extern char

Hi, I am trying to execute a simple hello world program compiled like so: path/to/compiled/clang -o test --target=aarch64-linux-gnu -march=armv8.5-a -fsanitize=hwaddress --sysroot=/usr/aarch64-linux-gnu/ -L/usr/lib/gcc/aarch64-linux-gnu/10.1.0/ -g test.c However, when I look at the disassembly, there is an unknown instruction listed at 0x2d51c: 000000000002d4c0 main: 2d4c0: ff c3 00 d1

Hi Dimitry, Thanks for your kind response! Thanks for the commit message of Jung's patch, I found that the bug had been fixed in OpenJDK 12 by Zhengyu https://bugs.openjdk.java.net/browse/JDK-8205965 But only backported to 11. So Jung could backport it for OpenJDK 8, thanks a lot! But I argue that the root cause might be in the compiler side, why clang-3.9.1, gcc-6.4.1 couldn't

Greetings, We present “Machine Function Splitter”, a codegen optimization pass which splits functions into hot and cold parts. This pass leverages the basic block sections feature recently introduced in LLVM from the Propeller project. The pass targets functions with profile coverage, identifies cold blocks and moves them to a separate section. The linker groups all cold blocks across functions

Hi R users, I am new to R and am trying to merge data frames in the following way. Suppose I have n data frames each with two fields. Field 1 is common among data frames but may have different entries. Field 2 is different. Data frame 1: Src Target1 1 aaa 1 bbb 1 ccc 2 aaa 3 ddd Data frame 2: Src Target2 2 aaaa 3 dddd 4 bbbb 4

I am trying to download data from NASA web-service. I am using the following code; for( i in 1:8) { target1 <- paste0(" https://hydro1.gesdisc.eosdis.nasa.gov/daac-bin/access/timeseries.cgi?variable=NLDAS:NLDAS_FORA0125_H.002:TMP2m&location=GEOM:POINT( ", cities[i, "lon_nldas"], ",%20",

Hi, I have a benchmark (mcf) that is currently slower when compiled with clang compared to gcc 8 (~10%). It seems that a hot loop has a few differences, where one interesting one is that while clang stores an incremented value in each iteration, gcc waits and just stores the final value just once after the loop. The value is a global variable. I wonder if this is something clang does not do

Sorry, quick message to ignore what I wrote before, I got myself confused (probably you too), With a recent trunk build I get this: f: adrp x8, g ldr x8, [x8, :lo12:g] mov w2, #16 mov x1, x0 mov x0, x8 b memcmp This looks more correct, and I need to look a bit more into this (and how clang 10.0.0 behaves).

Hi LLVM and GCC developers, My sincere thanks will goto: * Duncan, the core developer of llvm-gcc and dragonegg http://llvm.org/devmtg/2009-10/Sands_LLVMGCCPlugin.pdf * David, the innovator and developer of GCC https://dmalcolm.fedorapeople.org/gcc/global-state/requirements.html and others who give me kind response for teaching me patiently and carefully about how to migrate GCC v4.8.x to

On Tue, Aug 4, 2020 at 10:51 PM aditya kumar <hiraditya at gmail.com> wrote: > Glad to hear that there is an interest in a function splitting pass. There > are advantages to splitting functions at different stages as you've already > noted. > Right -- with slightly different objectives. Machine Function Splitting Pass's main focus is on performance improvement. > -

Hi All, The following code : void hexagon2( int *a, int *res ) { int i = 100; while ( i-- ) { *res++ = *a++; } } gets compiled as a sub-optimal Software loop on LLVM 9.0 instead of a Hardware loop, whereas it was compiled as a Hardware Loop in LLVM 7.0. This is the final assembly code generated by LLVM 9.0 : .text .file "main.c" .globl hexagon2 // --

Hi Thanks Gabor for your suggestion. I am posting the code that worked for me. dataframe1 = data.frame(cbind(Src = c(1,1,1,2,3), Target1 = c('aaa','bbb','ccc','aaa','ddd'))); #must be data frame dataframe2 = data.frame(cbind(Src = c(2,3,4,4,4), Target2 = c('aaaa','dddd','bbbb','eeee','ffff'))); dataframe3 =

https://bugzilla.netfilter.org/show_bug.cgi?id=1144 Bug ID: 1144 Summary: set add always returns false or otherwise ends evaluation Product: nftables Version: unspecified Hardware: x86_64 OS: All Status: NEW Severity: normal Priority: P5 Component: kernel

Hi, Recently 10% performance regression on an important benchmark showed up after we integrated https://reviews.llvm.org/rL318299. The analysis showed that rL318299 triggered loop rotation on an multi exits loop, and the loop rotation introduced code layout issue. The performance regression is a side-effect of rL318299. I got two testcases a.ll and b.ll attached to illustrate the problem. a.ll

On Mon, Dec 18, 2017 at 5:46 PM Xinliang David Li <davidxl at google.com> wrote: > The introduction of cleanup.cond block in b.ll without loop-rotation > already makes the layout worse than a.ll. > > > Without introducing cleanup.cond block, the layout out is > > entry->while.cond -> while.body->ret > > All the arrows are hot fall through edges which is

> On Oct 15, 2017, at 2:02 PM, Miluji Sb <milujisb at gmail.com> wrote: > > Dear all, > > i am trying to download time-series climatic data from GES DISC (NASA) > Hydrology Data Rods web-service. Unfortunately, no wget method is > available. > > Five parameters are needed for data retrieval: variable, location, > startDate, endDate, and type. For example:

hi,all the following are files of pool and volume. storage pool is based on logical(LVM) and iscsi,now I create volume specified the format to "qcow2" *pool.xml* <pool type='logical'> <name>pool_190</name> <source> <device path='/dev/disk/by-path/ip-192.168.0.190:3260-iscsi-iqn.2012-11.com.cloudking:server.target1-lun-1'/>

from https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html Under certain circumstances, GCC may duplicate (or remove duplicates of) > your assembly code when optimizing. This can lead to unexpected duplicate > symbol errors during compilation if your asm code defines symbols or > labels. Using ‘%=’ (see AssemblerTemplate) may help resolve this problem. ‘%=’ > Outputs a number that is

Dear David, This is amazing, thank you so much. If I may ask another question: The output looks like the following: ### dput(head(x,15)) c("Metadata for Requested Time Series:", "", "prod_name=GLDAS_NOAH025_3H_v2.0", "param_short_name=Tair_f_inst", "param_name=Near surface air temperature", "unit=K",