* [PATCH] Fix x86_64 __FP_CLZ
@ 2007-01-10 19:31 Jakub Jelinek
0 siblings, 0 replies; only message in thread
From: Jakub Jelinek @ 2007-01-10 19:31 UTC (permalink / raw)
To: Ulrich Drepper; +Cc: Glibc hackers
Hi!
bsrq %rdx, %eax ins not a valid instruction. While we could tweak these
macros to store result in the same sized variable as input and only then
copy to r and furthermore handle the various sizeof (x) cases, GCC 3.4+
contains __builtin_clz{,l,ll} and the generic soft-fp.h definition already
handles that all (plus __builtin_clz expands to bsrl on i?86/x86_64
and __builtin_clzl on x86_64 to bsrq).
2007-01-10 Jakub Jelinek <jakub@redhat.com>
* sysdeps/i386/soft-fp/sfp-machine.h (__FP_CLZ): Remove.
* sysdeps/x86_64/soft-fp/sfp-machine.h (__FP_CLZ): Likewise.
--- libc/sysdeps/i386/soft-fp/sfp-machine.h.jj 2002-11-01 22:49:28.000000000 +0100
+++ libc/sysdeps/i386/soft-fp/sfp-machine.h 2007-01-10 12:15:01.000000000 +0100
@@ -27,12 +27,6 @@
: "0"(xh), "1"(xl), "g"(yh), "g"(yl) \
: "cc")
-#define __FP_CLZ(r, x) \
- do { \
- __asm__("bsrl %1,%0" : "=r"(r) : "g"(x) : "cc"); \
- r ^= 31; \
- } while (0)
-
#define _i386_mul_32_64(rh, rl, x, y) \
__asm__("mull %2" : "=d"(rh), "=a"(rl) : "%g"(x), "1"(y) : "cc")
--- libc/sysdeps/x86_64/soft-fp/sfp-machine.h.jj 2002-11-01 22:49:29.000000000 +0100
+++ libc/sysdeps/x86_64/soft-fp/sfp-machine.h 2007-01-10 12:13:31.000000000 +0100
@@ -3,12 +3,6 @@
#define _FP_WS_TYPE signed long
#define _FP_I_TYPE long
-#define __FP_CLZ(r, x) \
- do { \
- __asm__("bsrq %1,%0" : "=r"(r) : "g"(x) : "cc"); \
- r ^= 63; \
- } while (0)
-
#define _FP_NANFRAC_S _FP_QNANBIT_S
#define _FP_NANFRAC_D _FP_QNANBIT_D, 0
#define _FP_NANFRAC_Q _FP_QNANBIT_Q, 0, 0, 0
Jakub
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2007-01-10 19:31 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-01-10 19:31 [PATCH] Fix x86_64 __FP_CLZ Jakub Jelinek
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).