Hi Christophe,
On Tue, Aug 13, 2019 at 09:59:35AM +, Christophe Leroy wrote:
> + rldicr \r, \r, 32, 31
Could you please write this as
sldi\r, \r, 32
? It's much easier to read, imo (it's the exact same instruction).
You can do a lot cheaper sequences if you
Le 14/08/2019 à 04:08, Paul Mackerras a écrit :
On Tue, Aug 13, 2019 at 09:59:35AM +, Christophe Leroy wrote:
[snip]
+.macro __LOAD_REG_IMMEDIATE r, x
+ .if \x & ~0x != 0
+ __LOAD_REG_IMMEDIATE_32 \r, (\x) >> 32
+ rldicr \r, \r, 32, 31
+
On Tue, Aug 13, 2019 at 09:59:35AM +, Christophe Leroy wrote:
[snip]
> +.macro __LOAD_REG_IMMEDIATE r, x
> + .if \x & ~0x != 0
> + __LOAD_REG_IMMEDIATE_32 \r, (\x) >> 32
> + rldicr \r, \r, 32, 31
> + .if (\x) & 0x != 0
> +
Today LOAD_REG_IMMEDIATE() is a basic #define which loads all
parts on a value into a register, including the parts that are NUL.
This means always 2 instructions on PPC32 and always 5 instructions
on PPC64. And those instructions cannot run in parallele as they are
updating the same register.
Ex
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