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* [Bug c/68044] New: ceil() with -O3 and -masm=intel fails to compile
@ 2015-10-21 21:43 janisozaur+gcc at gmail dot com
2015-10-21 22:08 ` [Bug c/68044] " pinskia at gcc dot gnu.org
2015-10-21 23:43 ` joseph at codesourcery dot com
0 siblings, 2 replies; 3+ messages in thread
From: janisozaur+gcc at gmail dot com @ 2015-10-21 21:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68044
Bug ID: 68044
Summary: ceil() with -O3 and -masm=intel fails to compile
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: janisozaur+gcc at gmail dot com
Target Milestone: ---
Created attachment 36559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36559&action=edit
test case file
on Arch Linux with gcc 5.2.0, glibc 2.22-3
Test case to be compiled with:
gcc test.c -o test -m32 -O3 -masm=intel
the ceil() function is taken from /usr/include/bits/mathinline.h, verbatim
provided here:
__inline_mathcodeNP (ceil, __x, \
register long double __value; \
register int __ignore; \
unsigned short int __cw; \
unsigned short int __cwtmp; \
__asm __volatile ("fnstcw %3\n\t" \
"movzwl %3, %1\n\t" \
"andl $0xf3ff, %1\n\t" \
"orl $0x0800, %1\n\t" /* rounding up */ \
"movw %w1, %2\n\t" \
"fldcw %2\n\t" \
"frndint\n\t" \
"fldcw %3" \
: "=t" (__value), "=&q" (__ignore), "=m" (__cwtmp), \
"=m" (__cw) \
: "0" (__x)); \
return __value)
This works fine without -masm=intel
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/68044] ceil() with -O3 and -masm=intel fails to compile
2015-10-21 21:43 [Bug c/68044] New: ceil() with -O3 and -masm=intel fails to compile janisozaur+gcc at gmail dot com
@ 2015-10-21 22:08 ` pinskia at gcc dot gnu.org
2015-10-21 23:43 ` joseph at codesourcery dot com
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2015-10-21 22:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68044
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a bug in the glibc headers for not supporting the alternative
inline-Asm. Please report it to them.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/68044] ceil() with -O3 and -masm=intel fails to compile
2015-10-21 21:43 [Bug c/68044] New: ceil() with -O3 and -masm=intel fails to compile janisozaur+gcc at gmail dot com
2015-10-21 22:08 ` [Bug c/68044] " pinskia at gcc dot gnu.org
@ 2015-10-21 23:43 ` joseph at codesourcery dot com
1 sibling, 0 replies; 3+ messages in thread
From: joseph at codesourcery dot com @ 2015-10-21 23:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68044
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I don't think use of -masm=intel is within the scope of what glibc wants
to support for inline asm in its headers. Rather, GCC should be made to
inline the relevant function if it doesn't already, and then the glibc
macro disabled for recent-enough GCC.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-10-21 23:43 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2015-10-21 21:43 [Bug c/68044] New: ceil() with -O3 and -masm=intel fails to compile janisozaur+gcc at gmail dot com
2015-10-21 22:08 ` [Bug c/68044] " pinskia at gcc dot gnu.org
2015-10-21 23:43 ` joseph at codesourcery dot com
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