https://llvm.org/bugs/show_bug.cgi?id=29083
Bug ID: 29083
Summary: [X86][SSE] Improve costs for floating point operations
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Having a base (throughput) cost of 2 for fadd/fsub/fmul/fdiv/fsqrt is just
wrong - either a little too high or phenomenally too low.
The scalar costs probably need reviewing as well.
Hopefully we can use SSE41/AVX/AVX2 as a reasonable analogue for the improved
throughputs of FDIV/FSQRT with more recent hardware (SB, HSW, SKL).
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