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[X86] Add strict fp support for operations of X87 instructions

Authored by craig.topper on Tue, Nov 26, 10:59 AM.

Description

[X86] Add strict fp support for operations of X87 instructions

This is the following patch of D68854.

This patch adds basic operations of X87 instructions, including +, -, *, / , fp extensions and fp truncations.

Patch by Chen Liu(LiuChen3)

Differential Revision: https://reviews.llvm.org/D68857

Details