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| author | Josh Bleecher Snyder <josharian@gmail.com> | 2018-04-23 13:49:51 -0700 |
|---|---|---|
| committer | Josh Bleecher Snyder <josharian@gmail.com> | 2018-04-23 22:40:10 +0000 |
| commit | d292f77e95fd9afdbfcfa12c9552d5926cdde8b1 (patch) | |
| tree | 548e3d13213f820e0b37bf81abf9389221daa41f /src/runtime | |
| parent | c0769741f541d2382c5c9b4506d684a738d7e53e (diff) | |
| download | go-d292f77e95fd9afdbfcfa12c9552d5926cdde8b1.tar.xz | |
cmd/compile: rewrite 2*x+c into LEAx1 on amd64
Rewrite x<<1+c into x+x+c, which can be expressed as a single LEAQ/LEAL.
Bit of a special case, but the single-instruction
LEA is both shorter and faster than SHL then ADD.
Triggers 293 times during make.bash.
Change-Id: I3f09c8e9a8f3859d1eeed336f095fc3ada79c2c1
Reviewed-on: https://go-review.googlesource.com/108938
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/runtime')
0 files changed, 0 insertions, 0 deletions