https://bugs.llvm.org/show_bug.cgi?id=36246
Bug ID: 36246
Summary: [X86] EVEX to VEX should turn VRNDSCALE into VROUND
when possible.
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: craig.top...@gmail.com
CC: llvm-bugs@lists.llvm.org
VRNDSCALE has an 8-bit where the behavior of values 0-15 match the behavior of
VROUND while larger values do not. isel prefers VRNDSCALE for the extended
register encoding space, but we should be able to turn VRNDSCALE into VROUND if
the immediate is 0-15, no masking is used, and the registers are xmm0-xmm15 or
ymm0-ymm15.
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