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PATCH: Disable hint in B unit for Montecito
- From: "H. J. Lu" <hjl at lucon dot org>
- To: binutils at sources dot redhat dot com
- Cc: wilson at specifixinc dot com
- Date: Wed, 16 Feb 2005 09:02:29 -0800
- Subject: PATCH: Disable hint in B unit for Montecito
Montecito supports the hint@pause on .i, .m, .f ports only. hint@pause
on a b syllable decodes to a nop. Anticipated performance gains may not
be realized for any hint@pause.b instruction.
BTW, Montecito is the code name for the next Itanium processor. The 2.4
and 2.6 Linux kernels are OK with this patch.
H.J.
---
gas/
2005-02-16 H.J. Lu <hongjiu.lu@intel.com>
* NEWS: Mention "-mhint.b=[ok|warning|error]".
* config/tc-ia64.c (md): Add hint_b.
(emit_one_bundle): Don't emit "hint" in B unit if md.hint_b
isn't ok.
(md_parse_option): Accepted "-mhint.b=[ok|warning|error]".
(md_show_usage): Add "-mhint.b=[ok|warning|error]".
(ia64_init): Set md.hint_b to error.
(md_assemble): Handle md.hint_b for "hint.b".
* doc/as.texinfo: Add "-mhint.b=[ok|warning|error]".
* doc/c-ia64.texi: Likewise.
gas/testsuite/
2005-02-16 H.J. Lu <hongjiu.lu@intel.com>
* gas/ia64/hint.b-err.l: New file.
* gas/ia64/hint.b-err.s: Likewise.
* gas/ia64/hint.b-warn.l: Likewise.
* gas/ia64/hint.b-warn.s: Likewise.
* gas/ia64/ia64.exp: Run hint.b-err and hint.b-warn.
* gas/ia64/opc-b.d: Pass -mhint.b=ok to as.
--- gas/NEWS.hint 2005-02-14 09:31:16.901853962 -0800
+++ gas/NEWS 2005-02-14 09:38:16.167586419 -0800
@@ -1,5 +1,7 @@
-*- text -*-
+* New command line option -mhint.b=[ok|warning|error] for IA64 targets.
+
* New command line option -munwind-check=[warning|error] for IA64
targets.
--- gas/config/tc-ia64.c.hint 2005-02-14 09:31:17.057833772 -0800
+++ gas/config/tc-ia64.c 2005-02-14 09:37:19.873872780 -0800
@@ -221,6 +221,14 @@ static struct
that are predicatable. */
expressionS qp;
+ /* What to do when hint.b is used. */
+ enum
+ {
+ hint_b_error,
+ hint_b_warning,
+ hint_b_ok
+ } hint_b;
+
unsigned int
manual_bundling : 1,
debug_dv: 1,
@@ -6564,9 +6572,16 @@ emit_one_bundle ()
enum ia64_opnd opnd1, opnd2;
if ((strcmp (idesc->name, "nop") == 0)
- || (strcmp (idesc->name, "hint") == 0)
|| (strcmp (idesc->name, "break") == 0))
insn_unit = required_unit;
+ else if (strcmp (idesc->name, "hint") == 0)
+ {
+ if (required_unit == IA64_UNIT_B
+ && md.hint_b != hint_b_ok)
+ insn_unit = IA64_UNIT_I;
+ else
+ insn_unit = required_unit;
+ }
else if (strcmp (idesc->name, "chk.s") == 0
|| strcmp (idesc->name, "mov") == 0)
{
@@ -6775,6 +6790,18 @@ md_parse_option (c, arg)
else
return 0;
}
+ else if (strncmp (arg, "hint.b=", 7) == 0)
+ {
+ arg += 7;
+ if (strcmp (arg, "ok") == 0)
+ md.hint_b = hint_b_ok;
+ else if (strcmp (arg, "warning") == 0)
+ md.hint_b = hint_b_warning;
+ else if (strcmp (arg, "error") == 0)
+ md.hint_b = hint_b_error;
+ else
+ return 0;
+ }
else
return 0;
break;
@@ -6889,6 +6916,8 @@ IA-64 options:\n\
-mle | -mbe select little- or big-endian byte order (default -mle)\n\
-munwind-check=[warning|error]\n\
unwind directive check (default -munwind-check=warning)\n\
+ -mhint.b=[ok|warning|error]\n\
+ hint.b check (default -mhint.b=error)\n\
-x | -xexplicit turn on dependency violation checking\n\
-xauto automagically remove dependency violations (default)\n\
-xnone turn off dependency violation checking\n\
@@ -7241,6 +7270,7 @@ ia64_init (argc, argv)
md.detect_dv = 1;
/* FIXME: We should change it to unwind_check_error someday. */
md.unwind_check = unwind_check_warning;
+ md.hint_b = hint_b_error;
}
/* Return a string for the target object file format. */
@@ -10432,6 +10462,20 @@ md_assemble (str)
TOUPPER (unit));
}
}
+ else if (strcmp (idesc->name, "hint.b") == 0)
+ {
+ switch (md.hint_b)
+ {
+ case hint_b_ok:
+ break;
+ case hint_b_warning:
+ as_warn ("hint.b may be treated as nop");
+ break;
+ case hint_b_error:
+ as_bad ("hint.b shouldn't be used");
+ break;
+ }
+ }
qp_regno = 0;
if (md.qp.X_op == O_register)
--- gas/doc/as.texinfo.hint 2005-02-11 13:18:37.000000000 -0800
+++ gas/doc/as.texinfo 2005-02-14 09:33:54.644436595 -0800
@@ -316,6 +316,7 @@ gcc(1), ld(1), and the Info entries for
[@b{-milp32}|@b{-milp64}|@b{-mlp64}|@b{-mp64}]
[@b{-mle}|@b{mbe}]
[@b{-munwind-check=warning}|@b{-munwind-check=error}]
+ [@b{-mhint.b=ok}|@b{-mhint.b=warning}|@b{-mhint.b=error}]
[@b{-x}|@b{-xexplicit}] [@b{-xauto}] [@b{-xdebug}]
@end ifset
@ifset IP2K
--- gas/doc/c-ia64.texi.hint 2005-02-14 09:31:17.324799218 -0800
+++ gas/doc/c-ia64.texi 2005-02-14 09:33:54.645436465 -0800
@@ -73,6 +73,15 @@ will make the assembler issue a warning
fails. This is the default. @code{-munwind-check=error} will make the
assembler issue an error when an unwind directive check fails.
+@item -mhint.b=ok
+@item -mhint.b=warning
+@item -mhint.b=error
+These options control what assembler will do when the @samp{hint.b}
+instruction is used. @code{-mhint.b=ok} will make assembler to accept
+@samp{hint.b}. @code{-mhint.b=warning} will make assembler to issue
+a warning when @samp{hint.b} is used. @code{-mhint.b=error} will make
+assembler to treat @samp{hint.b} as an error, which is the default.
+
@item -x
@item -xexplicit
These options turn on dependency violation checking.
--- gas/testsuite/gas/ia64/hint.b-err.l.hint 2005-02-14 09:33:54.645436465 -0800
+++ gas/testsuite/gas/ia64/hint.b-err.l 2005-02-14 09:33:54.645436465 -0800
@@ -0,0 +1,3 @@
+.*: Assembler messages:
+.*:1: Error: hint.b shouldn't be used
+.*:2: Error: hint.b shouldn't be used
--- gas/testsuite/gas/ia64/hint.b-err.s.hint 2005-02-14 09:33:54.646436336 -0800
+++ gas/testsuite/gas/ia64/hint.b-err.s 2005-02-14 09:33:54.646436336 -0800
@@ -0,0 +1,2 @@
+ hint.b @pause
+ hint.b 0x1ffff
--- gas/testsuite/gas/ia64/hint.b-warn.l.hint 2005-02-14 09:33:54.646436336 -0800
+++ gas/testsuite/gas/ia64/hint.b-warn.l 2005-02-14 09:33:54.646436336 -0800
@@ -0,0 +1,3 @@
+.*: Assembler messages:
+.*:1: Warning: hint.b may be treated as nop
+.*:2: Warning: hint.b may be treated as nop
--- gas/testsuite/gas/ia64/hint.b-warn.s.hint 2005-02-14 09:33:54.647436206 -0800
+++ gas/testsuite/gas/ia64/hint.b-warn.s 2005-02-14 09:33:54.647436206 -0800
@@ -0,0 +1,2 @@
+ hint.b @pause
+ hint.b 0x1ffff
--- gas/testsuite/gas/ia64/ia64.exp.hint 2005-02-14 09:31:17.834733215 -0800
+++ gas/testsuite/gas/ia64/ia64.exp 2005-02-14 09:33:54.647436206 -0800
@@ -72,4 +72,6 @@ if [istarget "ia64-*"] then {
run_list_test "slot2" ""
run_list_test "unwind-err" "-munwind-check=error"
run_dump_test "operand-or"
+ run_list_test "hint.b-err" ""
+ run_list_test "hint.b-warn" "-mhint.b=warning"
}
--- gas/testsuite/gas/ia64/opc-b.d.hint 2005-02-14 09:31:17.867728944 -0800
+++ gas/testsuite/gas/ia64/opc-b.d 2005-02-14 09:39:23.858824822 -0800
@@ -1,4 +1,4 @@
-#as: -xnone
+#as: -xnone -mhint.b=ok
#objdump: -d
#name: ia64 opc-b