[PATCH] D75506: [X86] Fix bug: Scalar FMA intrinsics generate wrong result

[LiuChen via Phabricator via llvm-commits]

LiuChen3 added a comment.

In D75506#1902544 <https://reviews.llvm.org/D75506#1902544>, @pengfei wrote:

> Doesn't the modifier {z}  clean the upper 64 bits?


DEST[127:63]  should be unchanged. In the example, the upper 64bit should be upper 64 bit of 16(%rsp).


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