| commit | 585c9e8412540b10be5154d019828a1a27f7b4c4 | [log] [tgz] |
|---|---|---|
| author | Keith Randall <keithr@alum.mit.edu> | Sun Jan 20 10:52:11 2019 -0800 |
| committer | Keith Randall <khr@golang.org> | Fri Feb 15 23:13:09 2019 +0000 |
| tree | 95ef6dde3e463fd169a69eed0cc20b3e3b2d2b19 | |
| parent | e1acd854f754f496be341211e9deee53fc7e3404 [diff] |
cmd/compile: implement shifts by signed amounts Allow shifts by signed amounts. Panic if the shift amount is negative. TODO: We end up doing two compares per shift, see Ian's comment https://github.com/golang/go/issues/19113#issuecomment-443241799 that we could do it with a single comparison in the normal case. The prove pass mostly handles this code well. For instance, it removes the <0 check for cases like this: if s >= 0 { _ = x << s } _ = x << len(a) This case isn't handled well yet: _ = x << (y & 0xf) I'll do followon CLs for unhandled cases as needed. Update #19113 R=go1.13 Change-Id: I839a5933d94b54ab04deb9dd5149f32c51c90fa1 Reviewed-on: https://go-review.googlesource.com/c/158719 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
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