On 03/23/16 11:24, Evandro Menezes wrote:
On 03/17/16 15:09, Evandro Menezes wrote:
This patch implements FP division by an approximation using the Newton
series.
With this patch, DF division is sped up by over 100% and SF division,
zilch, both on A57 and on M1.
gcc/
* config/aarch64/aarch64-tuning-flags.def
(AARCH64_EXTRA_TUNE_APPROX_DIV_{SF,DF}: New tuning macros.
* config/aarch64/aarch64-protos.h
(AARCH64_EXTRA_TUNE_APPROX_DIV): New macro.
(aarch64_emit_approx_div): Declare new function.
* config/aarch64/aarch64.c
(aarch64_emit_approx_div): Define new function.
* config/aarch64/aarch64.md ("div<mode>3"): New expansion.
* config/aarch64/aarch64-simd.md ("div<mode>3"): Likewise.
This version of the patch cleans up the changes to the MD files and
optimizes the division when the numerator is 1.0.
Ping^1
--
Evandro Menezes
