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2010 Nov 21
0
[LLVMdev] Poor floating point optimizations?
I'm aware that there are IEEE requirements for floating point. But all C/C++ compilers like GCC or MSVC have unsafe/fast math switches that disable all problems related to NaN/Inf/+-0/precision etc because in some applications those are not as important as performance (for example graphics calculation). But as I understand, LLVM currently does not have such unsafe/fast math optimizations
2010 Nov 21
2
[LLVMdev] Poor floating point optimizations?
Hi Bob, > For example expressions like "1+x+1+x+1+x+1+x" (basically adding a lot of > constants and variables) are complied to a long series off<add>s both in IR > and > assembly code. > Both GCC and MSVC generates C1*x +C2 (mov + mul + add). > > I am new to using LLVM. I am using Visual Studio 2008 on Windows, targeting > 32-bit X86 code. I'm using
2008 Aug 08
2
Tick marks that correspond with bars on barplot
Hello all, I have created a barplot that shows change in hardwood/softwood density from 1965 to 2005 in 5 year periods (1965,1970, etc). I would like to have an X-axis where the labels for the years line up after every two bars in the plot (there is one bar for hardwood, and another for softwood). Below is my script: density<-read.table("F:\\Megan\\Vtest.csv", header=TRUE,