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AArch64: Enable fast shifts on Neoverse N1
authorWilco Dijkstra <wdijkstr@arm.com>
Mon, 24 May 2021 13:31:37 +0000 (14:31 +0100)
committerWilco Dijkstra <wdijkstr@arm.com>
Mon, 24 May 2021 14:00:42 +0000 (15:00 +0100)
commitb326f495218a213079f572bd9960903b3425da74
treed7343bdefe1ce099f5242135c878c9dcb8645be3tree | snapshot
parentfb0746f3a6b7fd0223efa71d0dc3fc02166e338bcommit | diff
AArch64: Enable fast shifts on Neoverse N1

Enable the fast shift feature in Neoverse N1 tuning - this means additions with
a shift left by 1-4 are as fast as addition. This improves multiply by constant
expansions, eg. x * 25 is now emitted using shifts rather than a multiply:

add w0, w0, w0, lsl 2
add w0, w0, w0, lsl 2

ChangeLog:
2020-09-11  Wilco Dijkstra  <wdijkstr@arm.com>

* config/aarch64/aarch64.c (neoversen1_tunings):
Enable AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND.
gcc/config/aarch64/aarch64.c diff | blob | history
Domain: System / Toolchain;