6ce543d137
This backport required manual cleanup as go1.20 combined the ANDCCconst and ANDconst opcodes into one. Similarly, CL 456736 introduced a suble bug by using (Select1 (ANDCCconst ...)). This usually worked because the same rule quietly changes the type of the newly created ANDCCconst to a tuple. This change exposed the bug, so fix it too. (ANDconst [y] (MOV.*reg x)) should only be merged when zero extending. Otherwise, sign bits are lost on negative values. (ANDconst [0xFF] (MOVBreg x)) should be simplified to a zero extension of x. Likewise for the MOVHreg variant. Fixes #61319 Change-Id: I04e4fd7dc6a826e870681f37506620d48393698b Reviewed-on: https://go-review.googlesource.com/c/go/+/508775 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Paul Murphy <murp@ibm.com> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-on: https://go-review.googlesource.com/c/go/+/509018 Auto-Submit: Heschi Kreinick <heschi@google.com> TryBot-Bypass: Heschi Kreinick <heschi@google.com> |
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README.md
The Go Programming Language
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