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arm - correctly handle denormal results during softfp subtraction

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2018-08-02  Nicolas Pitre <nico@fluxnic.net>

	PR libgcc/86512
	* config/arm/ieee754-df.S (adddf3): Don't shortcut denormal handling
	when exponent goes negative. Update my email address.
	* config/arm/ieee754-sf.S (addsf3): Likewise.

From-SVN: r263267
This commit is contained in:
Nicolas Pitre 2018-08-02 16:50:07 +00:00 committed by Richard Earnshaw
parent 01557bd44e
commit 89fff9cc2b
3 changed files with 18 additions and 9 deletions
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7
libgcc/ChangeLog
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@ -1,3 +1,10 @@
2018-08-02 Nicolas Pitre <nico@fluxnic.net>
PR libgcc/86512
* config/arm/ieee754-df.S: Don't shortcut denormal handling when
exponent goes negative. Update my email address.
* config/arm/ieee754-sf.S: Likewise.
2018-08-01 Martin Liska <mliska@suse.cz>
* libgcov-profiler.c (__gcov_indirect_call_profiler_v2): Do not

9
libgcc/config/arm/ieee754-df.S
View File

@ -1,7 +1,7 @@
/* ieee754-df.S double-precision floating point support for ARM
Copyright (C) 2003-2018 Free Software Foundation, Inc.
Contributed by Nicolas Pitre (nico@cam.org)
Contributed by Nicolas Pitre (nico@fluxnic.net)
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
@ -238,9 +238,10 @@ LSYM(Lad_a):
movs ip, ip, lsl #1
adcs xl, xl, xl
adc xh, xh, xh
tst xh, #0x00100000
sub r4, r4, #1
bne LSYM(Lad_e)
subs r4, r4, #1
do_it hs
cmphs xh, #0x00100000
bhs LSYM(Lad_e)
@ No rounding necessary since ip will always be 0 at this point.
LSYM(Lad_l):

11
libgcc/config/arm/ieee754-sf.S
View File

@ -1,7 +1,7 @@
/* ieee754-sf.S single-precision floating point support for ARM
Copyright (C) 2003-2018 Free Software Foundation, Inc.
Contributed by Nicolas Pitre (nico@cam.org)
Contributed by Nicolas Pitre (nico@fluxnic.net)
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
@ -168,10 +168,11 @@ LSYM(Lad_e):
LSYM(Lad_a):
movs r1, r1, lsl #1
adc r0, r0, r0
tst r0, #0x00800000
sub r2, r2, #1
bne LSYM(Lad_e)
subs r2, r2, #1
do_it hs
cmphs r0, #0x00800000
bhs LSYM(Lad_e)
@ No rounding necessary since r1 will always be 0 at this point.
LSYM(Lad_l):