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Sanjay Patel 02638731c1 transform obscured FP sign bit ops into a fabs/fneg using TLI hook

This is effectively a revert of:
http://reviews.llvm.org/rL249702 - [InstCombine] transform masking off of an FP sign bit into a fabs() intrinsic call (PR24886)
and:
http://reviews.llvm.org/rL249701 - [ValueTracking] teach computeKnownBits that a fabs() clears sign bits
and a reimplementation as a DAG combine for targets that have IEEE754-compliant fabs/fneg instructions.

This is intended to resolve the objections raised on the dev list:
http://lists.llvm.org/pipermail/llvm-dev/2016-April/098154.html
and:
https://llvm.org/bugs/show_bug.cgi?id=24886#c4

In the interest of patch minimalism, I've only partly enabled AArch64. PowerPC, MIPS, x86 and others can enable later.

Differential Revision: http://reviews.llvm.org/D19391

llvm-svn: 271573

2016-06-02 20:01:37 +00:00

AArch64

transform obscured FP sign bit ops into a fabs/fneg using TLI hook

2016-06-02 20:01:37 +00:00

AMDGPU

AMDGPU: Cleanup load tests

2016-06-02 19:54:26 +00:00

ARM

This adds support for Cortex-A73 as an available target.

2016-06-02 10:48:52 +00:00

BPF

[BPF] Remove exit-on-error from tests (PR27768, PR27769)