mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-17 05:29:24 +00:00
add a note
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50267 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
682f81032f
commit
7c400dcb03
@ -186,3 +186,26 @@ lowering would be:
|
||||
3. lvsl 0; splat index; vcmpeq to generate a select mask
|
||||
4. lvsl slot + x; vperm to rotate result into correct slot
|
||||
5. vsel result together.
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
Should codegen branches on vec_any/vec_all to avoid mfcr. Two examples:
|
||||
|
||||
#include <altivec.h>
|
||||
int f(vector float a, vector float b)
|
||||
{
|
||||
int aa = 0;
|
||||
if (vec_all_ge(a, b))
|
||||
aa |= 0x1;
|
||||
if (vec_any_ge(a,b))
|
||||
aa |= 0x2;
|
||||
return aa;
|
||||
}
|
||||
|
||||
vector float f(vector float a, vector float b) {
|
||||
if (vec_any_eq(a, b))
|
||||
return a;
|
||||
else
|
||||
return b;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user