[PATCH] D32219: [X86][SSE] Improve DIV/SQRT throughput estimates for SB/HW schedule models

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.

The current DIV/SQRT throughput estimates for SB/HW schedule models use the default 1cy value, which is highly unrealistic.

I've updated the values with estimates based on the latencies which is typically about right for DIV/SQRT units, its also in the ballpark of what Agner suggests - if anyone has even more accurate values that would be great but these alone should be a major improvement to scheduling.


Repository:
  rL LLVM

https://reviews.llvm.org/D32219

Files:
  lib/Target/X86/X86SchedHaswell.td
  lib/Target/X86/X86SchedSandyBridge.td
  test/CodeGen/X86/recip-fastmath.ll
  test/CodeGen/X86/sse-schedule.ll
  test/CodeGen/X86/sse2-schedule.ll

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