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From: hjl@varesearch.com (H.J. Lu)
To: medtekh@orc.ru
Cc: egcs@egcs.cygnus.com
Subject: Re: gcc-2.7 creates faster code than pgcc-1.1.1
Date: Thu, 04 Mar 1999 14:31:00 -0000	[thread overview]
Message-ID: <m10Igdx-000AUaC@shanghai.varesearch.com> (raw)

Hi,

It seems that "movzb? %al,%?ax" may be faster than "and? $255,%?ax".
This patch for egcs 1.1.2 seems to make gzip faster.

Thanks.


-- 
H.J. Lu (hjl@gnu.org)
---
Thu Mar  4 14:04:49 1999  H.J. Lu  (hjl@gnu.org)

	* config/i386/i386.md (zero_extendqihi2): Use "and" when target
	and source are both "ax" only if TARGET_ZERO_EXTEND_WITH_AND is
	true.
	(zero_extendqisi2): Likewise.

--- ../../../import/egcs-1.1.x/egcs/gcc/config/i386/i386.md	Sun Feb 14 08:30:40 1999
+++ config/i386/i386.md	Thu Mar  4 13:46:07 1999
@@ -1738,7 +1741,7 @@
   {
   rtx xops[2];
 
-  if ((TARGET_ZERO_EXTEND_WITH_AND || REGNO (operands[0]) == 0)
+  if ((TARGET_ZERO_EXTEND_WITH_AND || (0 & REGNO (operands[0]) == 0))
       && REG_P (operands[1]) 
       && REGNO (operands[0]) == REGNO (operands[1]))
     {
@@ -1819,7 +1822,7 @@
   {
   rtx xops[2];
 
-  if ((TARGET_ZERO_EXTEND_WITH_AND || REGNO (operands[0]) == 0)
+  if ((TARGET_ZERO_EXTEND_WITH_AND || (0 & REGNO (operands[0]) == 0))
       && REG_P (operands[1]) 
       && REGNO (operands[0]) == REGNO (operands[1]))
     {

WARNING: multiple messages have this Message-ID

From: hjl@varesearch.com (H.J. Lu)
To: medtekh@orc.ru
Cc: egcs@egcs.cygnus.com
Subject: Re: gcc-2.7 creates faster code than pgcc-1.1.1
Date: Wed, 31 Mar 1999 23:46:00 -0000	[thread overview]
Message-ID: <m10Igdx-000AUaC@shanghai.varesearch.com> (raw)
Message-ID: <19990331234600.Z3Slh9Du4IDwF00u0e2e3ECptWFWDZ1bf4KAw4hEhu8@z> (raw)

Hi,

It seems that "movzb? %al,%?ax" may be faster than "and? $255,%?ax".
This patch for egcs 1.1.2 seems to make gzip faster.

Thanks.


-- 
H.J. Lu (hjl@gnu.org)
---
Thu Mar  4 14:04:49 1999  H.J. Lu  (hjl@gnu.org)

	* config/i386/i386.md (zero_extendqihi2): Use "and" when target
	and source are both "ax" only if TARGET_ZERO_EXTEND_WITH_AND is
	true.
	(zero_extendqisi2): Likewise.

--- ../../../import/egcs-1.1.x/egcs/gcc/config/i386/i386.md	Sun Feb 14 08:30:40 1999
+++ config/i386/i386.md	Thu Mar  4 13:46:07 1999
@@ -1738,7 +1741,7 @@
   {
   rtx xops[2];
 
-  if ((TARGET_ZERO_EXTEND_WITH_AND || REGNO (operands[0]) == 0)
+  if ((TARGET_ZERO_EXTEND_WITH_AND || (0 & REGNO (operands[0]) == 0))
       && REG_P (operands[1]) 
       && REGNO (operands[0]) == REGNO (operands[1]))
     {
@@ -1819,7 +1822,7 @@
   {
   rtx xops[2];
 
-  if ((TARGET_ZERO_EXTEND_WITH_AND || REGNO (operands[0]) == 0)
+  if ((TARGET_ZERO_EXTEND_WITH_AND || (0 & REGNO (operands[0]) == 0))
       && REG_P (operands[1]) 
       && REGNO (operands[0]) == REGNO (operands[1]))
     {

             reply	other threads:[~1999-03-04 14:31 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1999-03-04 14:31 H.J. Lu [this message]
     [not found] ` < m10Igdx-000AUaC@shanghai.varesearch.com >
1999-03-04 16:04   ` Martin v. Loewis
     [not found]     ` < 199903050001.BAA00973@mira.isdn.cs.tu-berlin.de >
1999-03-04 16:46       ` H.J. Lu
     [not found]         ` < m10Iil3-000393C@ocean.lucon.org >
1999-03-04 17:03           ` Joe Buck
     [not found]             ` < 199903050102.RAA06944@atrus.synopsys.com >
1999-03-04 17:06               ` H.J. Lu
1999-03-31 23:46                 ` H.J. Lu
1999-03-31 23:46             ` Joe Buck
1999-03-05  6:52           ` craig
     [not found]             ` < 19990305145306.4796.qmail@deer >
1999-03-05  9:18               ` Jeffrey A Law
1999-03-31 23:46                 ` Jeffrey A Law
1999-03-31 23:46             ` craig
1999-03-31 23:46         ` H.J. Lu
1999-03-04 18:08       ` Jeffrey A Law
     [not found]         ` < 13494.920599668@hurl.cygnus.com >
1999-03-04 20:03           ` H.J. Lu
     [not found]             ` < m10Ilq3-00000YC@ocean.lucon.org >
1999-03-04 20:14               ` Jeffrey A Law
1999-03-31 23:46                 ` Jeffrey A Law
1999-03-31 23:46             ` H.J. Lu
1999-03-31 23:46         ` Jeffrey A Law
1999-03-31 23:46     ` Martin v. Loewis
1999-03-31 23:46 ` H.J. Lu
  -- strict thread matches above, loose matches on Subject: below --
1999-03-09  1:19 Òåðåõèí Âÿ÷åñëàâ
1999-03-31 23:46 ` Òåðåõèí Âÿ÷åñëàâ
1999-03-04 23:11 Терехин Вячеслав
     [not found] ` < 005601be66d7$ae033480$288230d4@main.medtech.ru >
1999-03-05  9:22   ` Alfred Perlstein
     [not found]     ` < Pine.BSF.3.96.990305121935.7355C-100000@cygnus.rush.net >
1999-03-05 13:02       ` Richard Henderson
1999-03-31 23:46         ` Richard Henderson
1999-03-31 23:46     ` Alfred Perlstein
1999-03-05 15:52   ` H.J. Lu
1999-03-31 23:46     ` H.J. Lu
1999-03-31 23:46 ` Терехин Вячеслав
1999-03-04  3:40 Терехин Вячеслав
     [not found] ` < 001401be6633$fed21a60$a18330d4@main.medtech.ru >
1999-03-04 13:20   ` Jamie Lokier
     [not found]     ` < 19990304222018.A21939@pcep-jamie.cern.ch >
1999-03-04 17:05       ` Zack Weinberg
     [not found]         ` < 199903050104.UAA15335@octiron.phys.columbia.edu >
1999-03-04 18:09           ` Jeffrey A Law
     [not found]             ` <law@hurl.cygnus.com>
     [not found]               ` < 13506.920599740@hurl.cygnus.com >
1999-03-04 20:04                 ` David Edelsohn
     [not found]                   ` < 9903050403.AA36338@marc.watson.ibm.com >
1999-03-04 20:31                     ` Jeffrey A Law
     [not found]                       ` < 13939.920608288@hurl.cygnus.com >
1999-03-05  6:53                         ` craig
     [not found]                           ` < 19990305143358.4747.qmail@deer >
1999-03-05  9:30                             ` Jeffrey A Law
     [not found]                               ` < 15755.920655014@hurl.cygnus.com >
1999-03-05 10:18                                 ` Joe Buck
1999-03-31 23:46                                   ` Joe Buck
1999-03-05 10:19                                 ` craig
1999-03-31 23:46                                   ` craig
1999-03-31 23:46                               ` Jeffrey A Law
1999-03-31 23:46                           ` craig
1999-03-31 23:46                       ` Jeffrey A Law
1999-03-07 11:01                     ` Zack Weinberg
1999-03-31 23:46                       ` Zack Weinberg
1999-03-31 23:46                   ` David Edelsohn
1999-03-31 23:46             ` Jeffrey A Law
1999-03-31 23:46         ` Zack Weinberg
1999-03-31 23:46     ` Jamie Lokier
1999-03-31 23:46 ` Терехин Вячеслав

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