|author||Lynn Boger <email@example.com>||Mon Nov 16 09:40:45 2020 -0500|
|committer||Lynn Boger <firstname.lastname@example.org>||Tue Nov 17 13:20:20 2020 +0000|
cmd/compile: fix rules regression with shifts on PPC64 Some rules for PPC64 were checking for a case where a shift followed by an 'and' of a mask could be lowered, depending on the format of the mask. The function to verify if the mask was valid for this purpose was not checking if the mask was 0 which we don't want to allow. This case can happen if previous optimizations resulted in that mask value. This fixes isPPC64ValidShiftMask to check for a mask of 0 and return false. This also adds a codegen testcase to verify it doesn't try to match the rules in the future. Fixes #42610 Change-Id: I565d94e88495f51321ab365d6388c01e791b4dbb Reviewed-on: https://go-review.googlesource.com/c/go/+/270358 Run-TryBot: Lynn Boger <email@example.com> TryBot-Result: Go Bot <firstname.lastname@example.org> Reviewed-by: Paul Murphy <email@example.com> Reviewed-by: Carlos Eduardo Seo <firstname.lastname@example.org> Trust: Lynn Boger <email@example.com>
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