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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26874 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2006-03-19 22:08:08 +00:00
parent 0bf1177f6f
commit 28097d086f
1 changed files with 10 additions and 0 deletions
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10
lib/Target/PowerPC/README.txt
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@ -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.
===-------------------------------------------------------------------------===