similar to: Redundant load in llvm's codegen compares to gcc when accessing escaped pointer?

1. Same question as David, why &c - 8 is invalid? Is it related to below statements In C99 standard? 6.5.3.3: "Among the invalid values for dereferencing a pointer by the unary * operator are a null pointer, an address inappropriately aligned for the type of object pointed to, and the address of an object after the end of its lifetime." 2. We are trying to preserve 1st load and

On 2016.03.17 at 16:35 -0700, Chris Lattner via llvm-dev wrote: > > > On Mar 15, 2016, at 7:58 AM, Chuang-Yu Cheng via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > > > Hi, > > > > Please look at this c code: > > > > typedef struct _PB { > > void* data; /* required.*/ > > int f1_; > > float f2_; > > } PB;

Agree, and I did : ) Please refer to this mailing list: https://gcc.gnu.org/ml/gcc/2016-03/msg00179.html On Sat, Mar 19, 2016 at 1:25 AM, Daniel Berlin <dberlin at dberlin.org> wrote: > I suspect you should just go ask #1 on the gcc mailing list and see what > the answer is. > We are basically trying to figure out their reasoning, but we should > instead just go ask what it is

Reply from Michael: &x points to the start of object x, and &x - something (something != 0) points outside object x. 'c' was a complete object, so &c-8 points outside any object, hence the formation of that pointer is already invalid (as is its dereference). https://gcc.gnu.org/ml/gcc/2016-03/msg00185.html >>On Fri, Mar 18, 2016 at 8:46 AM, Daniel Berlin <dberlin

The rationale given does not seem to square (IMHO) with the ubiquitous practice of having 0- or 1-length array at the end of a struct and then allocating additional elements for it using malloc, or the so-called "struct hack": http://c-faq.com/struct/structhack.html For example: typedef struct { enum inst_type type; unsigned num_ops; struct operand ops[1]; } inst;

The following example from the help page does not work: > f1_ gl(2,3); f1 > f2_ gl(3,2); f2 > f1:f2 # a factor, the ``cross'' f1 x f2 yields Warning in f1:f2 : Numerical expression has 6 elements: only the first used [1] 1 whereas R-0.61.2 yields > f1:f2 # a factor, the ``cross'' f1 x f2 [1] 1:1 1:1 1:2 2:2 2:3 2:3 Note that the new behavior is consistent with

Hi all, This patch is to fix a problem on PPC64 where an unaligned memcpy is generated. The testcase is this: $ cat testcase.c void Qux() { char Bar[11] = {0}; } What happens is that we produce LLVM code like this: call void @llvm.memcpy.i64( i8* %event_list2, i8* getelementptr ([11 x i8]* @C.103.30698, i32 0, i32 0), i64 11, i32 8 ) Notice that it has an 8-byte alignment. However, the Bar

On Nov 6, 2007, at 5:45 PM, Bill Wendling wrote: > Hi all, > > This patch is to fix a problem on PPC64 where an unaligned memcpy is > generated. The testcase is this: > > $ cat testcase.c > void Qux() { > char Bar[11] = {0}; > } > > What happens is that we produce LLVM code like this: > > call void @llvm.memcpy.i64( i8* %event_list2, i8* getelementptr ([11

This patch fixes the incorrect interpretation of endianness of MLDv2 maximum response code within bridge's multicast snooping code. Signed-off-by: Ang Way Chuang <wcang at sfc.wide.ad.jp> --- diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 977c3ee..29c6283 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1172,7 +1172,7 @@ static int

Dear R Users: Here is a nice simple question: On Version 1.0.0, where is the file that has the paper size for plots? UNIX Dec Alpha please? (Really dumb. I know.) Sincerely, Erin -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or

Hi: I need periodically rsync a bunch of very big files. These files are append-only so changes are already at the end of the file. Because files are big, I assume it will take some time comparing the first part of files. Is there a way that I can tell rsync to sync only the extra part at the end of file, and do not compare the first part of files? Thanks. Chuang

I have the following list of strings: x <- c("foo, foo2, foo3", "bar", "qux, qux1") what I want to do is to obtain foo, bar qux Namely for each element in the vector obtain only string before the first comma. What's the way to do it? - G.V. [[alternative HTML version deleted]]

Hi all: I tried to start a rsync daemon under my user name (not an administrator) on debian linux box(linux kernel 2.4.27), and failed. The command I used is > rsync -v -v --daemon --config=rsyncd.conf This command returns without any error although the daemon does not get started. The rsyncd.conf I used is as follows. Do I miss anything in the configuration file? Any help is appreciated.

Dear all, Suppose I have this data frame: > data_main V1 V2 foo 13.1 bar 12.0 qux 10.4 cho 20.33 pox 8.21 And I want to split the data into two parts first part are the one contain in the source array: > src [1] "bar" "pox" and the other one the complement. In the end we hope to get this two dataframes: > data_child1 V1 V2 bar 13.1 pox

Hi all: I am trying to transfer a file from a machine A to a machine B. I ran a rsync deamon on machine B at a given port. Because there is a firewall between these two machines, I opened the port on the firewall. Is this enough to get rsync work through firewall? When I tried the transfer, I got the following error messages. my command: rsync -a --copy-links localfile rsync:://me@<my

Dear all, I found that printing with 'cat' is very slow. For example in my machine this snippet __BEGIN__ # I need to resolve to use this type of loop. # because using write(), I need to create a matrix which # consumes so much memory. Note that "foo, bar, qux" object # is already very large (>2Gb) for ( s in 1:length(x) ) {

Hello, This is a proposal for implementing "module flags". Please take a look at this and give any feedback you may have. Thanks! -bw Module Flags Metadata Information about the module as a whole is difficult to convey to LLVM's subsystems. The LLVM IR isn't sufficient to transmit this information. One should instead use the llvm.module.flags named

> Hi, > I recently downloaded R on window and running Rgui on NT. I have never use > R before and trying to learn R by following An introduction to R. > I generated a table of 900x5 in excel and saved as tab delimited txt file. > I then do read.table but I keeping getting the following message > > data <- read.table("ML4mm25.txt", header=T, sep=" ")

What? Yet another EH proposal?! This one is different from the others in that I'm planning to start implementing this shortly. But I want your feedback! I've all ready gotten a lot of feedback from Chris, John, Jim, Eric, and many others. Now is your turn! Please read this proposal and send me your comments, suggestions, and concerns. -bw

Dear R community, I have a question concerning recoding of a variable. I have a data set in which there is a variable devoted to the ISCO code describing the occupation of this certain individual (http://www.ilo.org/public/english/bureau/stat/isco/isco88/major.htm). Every type of occupation begins with a number and every number added to this number describes th occupation more detailed. Now my