maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Add a note about the MUL -> FMADD vector bug. 

llvm-svn: 26874
This commit is contained in:
Chris Lattner 2006-03-19 22:08:08 +00:00
parent 89f33a14b8
commit 169e6238ad
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
llvm/lib/Target/PowerPC/README.txt
View File

@ -536,3 +536,13 @@ void foo(void) {
bar (x);
}
===-------------------------------------------------------------------------===
Altivec: Codegen'ing MUL with vector FMADD should add -0.0, not 0.0:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=8763
We need to codegen -0.0 vector efficiently (no constant pool load).
When -ffast-math is on, we can use 0.0.
===-------------------------------------------------------------------------===