Craig Topper 84b26b90d1 [X86] Add intrinsic support for the RDPID instruction ...

This adds a new instrinsic to support the rdpid instruction. The implementation is a bit weird because the intrinsic is defined as always returning 32-bits, but the assembler support thinks the instruction produces a 64-bit register in 64-bit mode. But really it zeros the upper 32 bits. So I had to add separate patterns where 64-bit mode uses an extract_subreg.

Differential Revision: https://reviews.llvm.org/D42205

llvm-svn: 322910

2018-01-18 23:52:31 +00:00

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