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[Bug math/20660] New: [arm] Use VSQRT
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 30 Sep 2016 16:03:34 +0000
- Subject: [Bug math/20660] New: [arm] Use VSQRT
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=20660
Bug ID: 20660
Summary: [arm] Use VSQRT
Product: glibc
Version: 2.24
Status: NEW
Severity: enhancement
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
Host: arm*-*-*
When built for VFP, ARM glibc should use the VSQRT instruction to implement
sqrt and sqrtf, instead of the software sqrt implementations used at present.
Note that GCC's vfp.md has a comment on its sqrt patterns
; VFP9 Erratum 760019: It's potentially unsafe to overwrite the input
; operands, so mark the output as early clobber for VFPv2 on ARMv5 or
; earlier.
which might be relevant to use in glibc as well.
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