llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-14 17:34:41 +00:00

History

Weiming Zhao 541681c848 Fix PR 17368: disable vector mul distribution for square of add/sub for ARM

Generally, it is desirable to distribute (a + b) * c to a*c + b*c for
ARM with VMLx forwarding, where a, b and c are vectors.
However, for (a + b)*(a + b), distribution will result in one extra
instruction.
With distribution:
  x = a + b (add)
  y = a * x (mul)
  z = y + b * y (mla)

Without distribution:
  x = a + b (add)
  z = x * x (mul)

This patch checks if a mul is a square of add/sub. If yes, skip
distribution.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191410 91177308-0d34-0410-b5e6-96231b3b80d8

2013-09-25 23:12:06 +00:00

AArch64

llvm/test/CodeGen/AArch64/neon-scalar-reduce-pairwise.ll: Use -mtriple here, or aach64-pecoff might be misassumed on win32 hosts.

2013-09-24 04:14:29 +00:00

ARM

Fix PR 17368: disable vector mul distribution for square of add/sub for ARM

2013-09-25 23:12:06 +00:00

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