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From: <sv...@va...> - 2009-11-22 23:43:30
|
Author: sewardj
Date: 2009-11-22 23:43:17 +0000 (Sun, 22 Nov 2009)
New Revision: 1929
Log:
Use a shorter instruction encoding for "mov $smallish positive int, %reg".
Reduces generated code size by about 1% for Memcheck.
Modified:
trunk/priv/host_amd64_defs.c
Modified: trunk/priv/host_amd64_defs.c
===================================================================
--- trunk/priv/host_amd64_defs.c 2009-11-22 23:38:01 UTC (rev 1928)
+++ trunk/priv/host_amd64_defs.c 2009-11-22 23:43:17 UTC (rev 1929)
@@ -2335,10 +2335,26 @@
if (i->Ain.Alu64R.op == Aalu_MOV) {
switch (i->Ain.Alu64R.src->tag) {
case Armi_Imm:
- *p++ = toUChar(0x48 + (1 & iregBit3(i->Ain.Alu64R.dst)));
- *p++ = 0xC7;
- *p++ = toUChar(0xC0 + iregBits210(i->Ain.Alu64R.dst));
- p = emit32(p, i->Ain.Alu64R.src->Armi.Imm.imm32);
+ if (0 == (i->Ain.Alu64R.src->Armi.Imm.imm32 & ~0xFFF)) {
+ /* Actually we could use this form for constants in
+ the range 0 through 0x7FFFFFFF inclusive, but
+ limit it to a small range for verifiability
+ purposes. */
+ /* Generate "movl $imm32, 32-bit-register" and let
+ the default zero-extend rule cause the upper half
+ of the dst to be zeroed out too. This saves 1
+ and sometimes 2 bytes compared to the more
+ obvious encoding in the 'else' branch. */
+ if (1 & iregBit3(i->Ain.Alu64R.dst))
+ *p++ = 0x41;
+ *p++ = 0xB8 + iregBits210(i->Ain.Alu64R.dst);
+ p = emit32(p, i->Ain.Alu64R.src->Armi.Imm.imm32);
+ } else {
+ *p++ = toUChar(0x48 + (1 & iregBit3(i->Ain.Alu64R.dst)));
+ *p++ = 0xC7;
+ *p++ = toUChar(0xC0 + iregBits210(i->Ain.Alu64R.dst));
+ p = emit32(p, i->Ain.Alu64R.src->Armi.Imm.imm32);
+ }
goto done;
case Armi_Reg:
*p++ = rexAMode_R( i->Ain.Alu64R.src->Armi.Reg.reg,
|
|
From: <sv...@va...> - 2009-11-22 23:38:18
|
Author: sewardj
Date: 2009-11-22 23:38:01 +0000 (Sun, 22 Nov 2009)
New Revision: 1928
Log:
Specialise "S after 32-bit SUB/CMP"; improves performance by about 2%
for Memcheck running bzip2.
Modified:
trunk/priv/guest_amd64_helpers.c
Modified: trunk/priv/guest_amd64_helpers.c
===================================================================
--- trunk/priv/guest_amd64_helpers.c 2009-11-13 16:55:17 UTC (rev 1927)
+++ trunk/priv/guest_amd64_helpers.c 2009-11-22 23:38:01 UTC (rev 1928)
@@ -1014,6 +1014,16 @@
binop(Iop_Shl64,cc_dep1,mkU8(32))));
}
+ if (isU64(cc_op, AMD64G_CC_OP_SUBL) && isU64(cond, AMD64CondS)) {
+ /* long sub/cmp, then S (negative) --> test (dst-src <s 0) */
+ return unop(Iop_1Uto64,
+ binop(Iop_CmpLT64S,
+ binop(Iop_Sub64,
+ binop(Iop_Shl64, cc_dep1, mkU8(32)),
+ binop(Iop_Shl64, cc_dep2, mkU8(32))),
+ mkU64(0)));
+ }
+
/*---------------- SUBW ----------------*/
if (isU64(cc_op, AMD64G_CC_OP_SUBW) && isU64(cond, AMD64CondZ)) {
|
|
From: Erez Z. <ere...@gm...> - 2009-11-22 09:01:41
|
Hi,
I'm trying to run 'make dist-bzip2' and I got the following error:
...
make[1]: Entering directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/tests'
mkdir -p -- /home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/tests/..
make[1]: Leaving directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/tests'
make[1]: Entering directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/perf'
mkdir -p -- /home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/perf/..
make[1]: Leaving directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/perf'
make[1]: Entering directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/auxprogs'
mkdir -p -- /home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/auxprogs/..
make[1]: Leaving directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/auxprogs'
make[1]: Entering directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/mpi'
mkdir -p -- /home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/mpi/..
make[1]: Leaving directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/mpi'
make[1]: Entering directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/docs'
mkdir -p -- /home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/docs/images
/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/docs/internals
/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/docs/lib
/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/docs/xml
make \
top_distdir="/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0"
distdir="/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/valgrind-3.5.0/docs"
\
dist-hook
make[2]: Entering directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/docs'
Generating the text version of the FAQ ...
export XML_CATALOG_FILES=/etc/xml/catalog && \
xsltproc --nonet --xinclude -o ./FAQ.txt
../docs/lib/vg-faq2txt.xsl ../docs/xml/FAQ.xml
I/O error : Attempt to load network entity
http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl
warning: failed to load external entity
"http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl"
compilation error: file ../docs/lib/vg-faq2txt.xsl line 10 element
import
xsl:import : unable to load
http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl
make[2]: *** [FAQ.txt] Error 5
make[2]: Leaving directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/docs'
make[1]: *** [distdir] Error 2
make[1]: Leaving directory
`/home1/erez.zilber/work/tmp/vlg/valgrind-3.5.0/docs'
make: *** [distdir] Error 1
I tried the following:
[erez.zilber@kpc39:~/work/tmp/vlg/valgrind-3.5.0]$ wget
http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl
--18:17:34-- http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl
Resolving docbook.sourceforge.net... 216.34.181.96
Connecting to docbook.sourceforge.net|216.34.181.96|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 12666 (12K) [text/xml]
Saving to: `docbook.xsl'
100%[=====================================================================================>]
12,666 22.9K/s in 0.5s
18:17:37 (22.9 KB/s) - `docbook.xsl' saved [12666/12666]
and it seems to work. What is wrong here?
Thanks,
Erez
|