Differential D28994

riscv: Add a soft-float implementation of fabs()
ClosedPublic
Actions

Authored by arichardson on Mar 1 2021, 11:30 AM.

Tags

None

Referenced Files

	F136439438: D28994.id.diff
	Mon, Nov 17, 7:36 PM

	Unknown Object (File)
	Sun, Nov 16, 10:38 PM

	Unknown Object (File)
	Sun, Nov 16, 1:49 PM

	Unknown Object (File)
	Sun, Nov 16, 1:44 PM

	Unknown Object (File)
	Sun, Nov 16, 7:52 AM

	Unknown Object (File)
	Sat, Nov 15, 11:51 PM

	Unknown Object (File)
	Fri, Nov 14, 4:57 AM

	Unknown Object (File)
	Mon, Nov 10, 7:43 PM

Subscribers

Details

Reviewers

dim
jrtc27

Commits

rG524b018d2004: riscv: Add a soft-float implementation of fabs()

Summary

We could just use a C implementation using __builtin_fabs(), but using
this assembly version guarantees that there is no additional prolog/epilog
code. Additionally, clang generates worse code for masking off the top bit
than GCC: https://bugs.llvm.org/show_bug.cgi?id=49377.

Test Plan

Should fix RISCV64 softfloat world build

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 37471
Build 34360: arc lint + arc unit

Event Timeline

arichardson created this revision.Mar 1 2021, 11:30 AM

Herald added a subscriber: imp. · View Herald TranscriptMar 1 2021, 11:30 AM

arichardson requested review of this revision.Mar 1 2021, 11:30 AM

Harbormaster completed remote builds in B37471: Diff 84888.Mar 1 2021, 11:31 AM

arichardson edited the test plan for this revision. (Show Details)Mar 1 2021, 11:31 AM

arichardson added a reviewer: jrtc27.

LGTM

This revision is now accepted and ready to land.Mar 1 2021, 11:32 AM

Closed by commit rG524b018d2004: riscv: Add a soft-float implementation of fabs() (authored by arichardson). · Explain WhyMar 1 2021, 12:57 PM

This revision was automatically updated to reflect the committed changes.

arichardson added a commit: rG524b018d2004: riscv: Add a soft-float implementation of fabs().

dim mentioned this in rG27e68baf24f1: Build lib/msun tests with compiler builtins disabled.Mar 9 2021, 8:22 PM

dim mentioned this in rGe91ff79b2811: Build lib/msun tests with compiler builtins disabled.

dim mentioned this in rG7ee9798bad0b: Build lib/msun tests with compiler builtins disabled.

Revision Contents
Changeset List

Path

Size

lib/

libc/

riscv/

gen/

11 lines

Diff 84888

lib/libc/riscv/gen/fabs.S

Loading...