release/21.x: [X86] getScalarMaskingNode - if the mask is zero just return the blended passthrough and preserved source value (#153575) #156430
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@phoebewang What do you think about merging this PR to the release branch? |
LGTM. |
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@nikic (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
…ded passthrough and preserved source value (llvm#153575) We already handle the case if the mask is one, so I added the other case where the op is replaced with a MOVSH/S/D blend. This assumes the scalar passthrough is op0. I had to adjust the test case for llvm#98306 as AFAICT it'd been over reduced Fixes llvm#153570 (cherry picked from commit ba707db)
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Backport ba707db
Requested by: @nikic