llvm-project

Commit Graph

Author	SHA1	Message	Date
Simon Pilgrim	6c21e6a54e	[X86][SSE] Improve recognition of uitofp conversions that can be performed as sitofp With D24253 we can now use SelectionDAG::SignBitIsZero with vector operations. This patch uses SelectionDAG::SignBitIsZero to recognise that a zero sign bit means that we can use a sitofp instead of a uitofp (which is not directly support on pre-AVX512 hardware). While AVX512 does provide support for uitofp, the conversion to sitofp should not cause any regressions. Differential Revision: https://reviews.llvm.org/D24343 llvm-svn: 281852	2016-09-18 12:45:23 +00:00
Simon Pilgrim	efab350967	[X86][SSE] Add test cases for PR29079 'Failure to recognise uitofp conversions that can be performed as sitofp' llvm-svn: 280670	2016-09-05 18:04:38 +00:00

Author

SHA1

Message

Date

Simon Pilgrim

6c21e6a54e

[X86][SSE] Improve recognition of uitofp conversions that can be performed as sitofp

With D24253 we can now use SelectionDAG::SignBitIsZero with vector operations.

This patch uses SelectionDAG::SignBitIsZero to recognise that a zero sign bit means that we can use a sitofp instead of a uitofp (which is not directly support on pre-AVX512 hardware).

While AVX512 does provide support for uitofp, the conversion to sitofp should not cause any regressions.

Differential Revision: https://reviews.llvm.org/D24343

llvm-svn: 281852

2016-09-18 12:45:23 +00:00

Simon Pilgrim

efab350967

[X86][SSE] Add test cases for PR29079

'Failure to recognise uitofp conversions that can be performed as sitofp'

llvm-svn: 280670

2016-09-05 18:04:38 +00:00

2 Commits