* More info on egcs alpha bug
@ 1997-09-09 14:53 H.J. Lu
1997-09-10 10:51 ` Richard Henderson
0 siblings, 1 reply; 4+ messages in thread
From: H.J. Lu @ 1997-09-09 14:53 UTC (permalink / raw)
To: rth; +Cc: egcs
There are 3 files for Linux/alpha from glibc 2.0.5:
1. rtld.c. The dynamic linker source code file from glibc 2.0.5.
2. good.s. The asm code generated by gcc 2.7.2.1. It works.
3. bad.s. The asm code generated by egcs 970904. It doesn't work.
good.s and bad.s are compiled with
-O2 -Wall -Winline -Wno-parentheses -Wstrict-prototypes -Wwrite-strings -mno-fp-regs -mieee -fPIC -fno-common -mbuild-constants
Someone who knows alpha assembly code may be able to tell
what went wrong.
Thanks.
H.J. Lu (hjl@gnu.ai.mit.edu)
----
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4U5,]U5,]U?-KG[\`9#7V=`#(````
`
end
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: More info on egcs alpha bug
1997-09-09 14:53 More info on egcs alpha bug H.J. Lu
@ 1997-09-10 10:51 ` Richard Henderson
1997-09-10 18:32 ` Richard Henderson
1997-09-10 18:34 ` Richard Henderson
0 siblings, 2 replies; 4+ messages in thread
From: Richard Henderson @ 1997-09-10 10:51 UTC (permalink / raw)
To: H.J. Lu; +Cc: egcs
> -O2 -Wall -Winline -Wno-parentheses -Wstrict-prototypes -Wwrite-strings
> -mno-fp-regs -mieee -fPIC -fno-common -mbuild-constants
Ah hah. bad.s isn't respecting -mbuild-constants.
That option was added specifically for ld.so because we can't load
constants from memory that early in the bootstrap process, and so
we don't care that it takes a half-dozen instructions to build it up.
I'll look into this.
r~
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: More info on egcs alpha bug
1997-09-10 10:51 ` Richard Henderson
@ 1997-09-10 18:32 ` Richard Henderson
1997-09-10 18:34 ` Richard Henderson
1 sibling, 0 replies; 4+ messages in thread
From: Richard Henderson @ 1997-09-10 18:32 UTC (permalink / raw)
To: hjl; +Cc: egcs
> Ah hah. bad.s isn't respecting -mbuild-constants.
The following patch fixes the problem.
r~
Wed Sep 10 18:30:02 1997 Richard Henderson <rth@cygnus.com>
* alpha.md (movdi): Handle CONST_DOUBLE for TARGET_BUILD_CONSTANTS.
Index: alpha.md
===================================================================
RCS file: /cvs/cvsfiles/egcs/gcc/config/alpha/alpha.md,v
retrieving revision 1.3
diff -u -p -d -r1.3 alpha.md
--- alpha.md 1997/09/03 01:27:01 1.3
+++ alpha.md 1997/09/11 01:30:54
@@ -3830,30 +3830,41 @@
else
operands[1] = tem;
}
- else if (TARGET_BUILD_CONSTANTS
- && GET_CODE (operands[1]) == CONST_INT)
+ else if (CONSTANT_P (operands[1]))
{
+ if (TARGET_BUILD_CONSTANTS)
+ {
#if HOST_BITS_PER_WIDE_INT == 64
- tem = alpha_emit_set_long_const (operands[0], INTVAL (operands[1]));
- if (rtx_equal_p (tem, operands[0]))
- DONE;
- else
- operands[1] = tem;
+ HOST_WIDE_INT i;
+
+ if (GET_CODE (operands[1]) == CONST_INT)
+ i = INTVAL (operands[1]);
+ else if (GET_CODE (operands[1]) == CONST_DOUBLE)
+ i = CONST_DOUBLE_LOW (operands[1]);
+ else
+ abort();
+
+ tem = alpha_emit_set_long_const (operands[0], i);
+ if (rtx_equal_p (tem, operands[0]))
+ DONE;
+ else
+ operands[1] = tem;
#else
- abort();
+ abort();
#endif
- }
- else if (CONSTANT_P (operands[1]))
- {
- operands[1] = force_const_mem (DImode, operands[1]);
- if (reload_in_progress)
- {
- emit_move_insn (operands[0], XEXP (operands[1], 0));
- operands[1] = copy_rtx (operands[1]);
- XEXP (operands[1], 0) = operands[0];
}
else
- operands[1] = validize_mem (operands[1]);
+ {
+ operands[1] = force_const_mem (DImode, operands[1]);
+ if (reload_in_progress)
+ {
+ emit_move_insn (operands[0], XEXP (operands[1], 0));
+ operands[1] = copy_rtx (operands[1]);
+ XEXP (operands[1], 0) = operands[0];
+ }
+ else
+ operands[1] = validize_mem (operands[1]);
+ }
}
else
abort ();
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: More info on egcs alpha bug
1997-09-10 10:51 ` Richard Henderson
1997-09-10 18:32 ` Richard Henderson
@ 1997-09-10 18:34 ` Richard Henderson
1 sibling, 0 replies; 4+ messages in thread
From: Richard Henderson @ 1997-09-10 18:34 UTC (permalink / raw)
To: egcs
> Ah hah. bad.s isn't respecting -mbuild-constants.
The following patch fixes the problem.
r~
Wed Sep 10 18:30:02 1997 Richard Henderson <rth@cygnus.com>
* alpha.md (movdi): Handle CONST_DOUBLE for TARGET_BUILD_CONSTANTS.
Index: alpha.md
===================================================================
RCS file: /cvs/cvsfiles/egcs/gcc/config/alpha/alpha.md,v
retrieving revision 1.3
diff -u -p -d -r1.3 alpha.md
--- alpha.md 1997/09/03 01:27:01 1.3
+++ alpha.md 1997/09/11 01:30:54
@@ -3830,30 +3830,41 @@
else
operands[1] = tem;
}
- else if (TARGET_BUILD_CONSTANTS
- && GET_CODE (operands[1]) == CONST_INT)
+ else if (CONSTANT_P (operands[1]))
{
+ if (TARGET_BUILD_CONSTANTS)
+ {
#if HOST_BITS_PER_WIDE_INT == 64
- tem = alpha_emit_set_long_const (operands[0], INTVAL (operands[1]));
- if (rtx_equal_p (tem, operands[0]))
- DONE;
- else
- operands[1] = tem;
+ HOST_WIDE_INT i;
+
+ if (GET_CODE (operands[1]) == CONST_INT)
+ i = INTVAL (operands[1]);
+ else if (GET_CODE (operands[1]) == CONST_DOUBLE)
+ i = CONST_DOUBLE_LOW (operands[1]);
+ else
+ abort();
+
+ tem = alpha_emit_set_long_const (operands[0], i);
+ if (rtx_equal_p (tem, operands[0]))
+ DONE;
+ else
+ operands[1] = tem;
#else
- abort();
+ abort();
#endif
- }
- else if (CONSTANT_P (operands[1]))
- {
- operands[1] = force_const_mem (DImode, operands[1]);
- if (reload_in_progress)
- {
- emit_move_insn (operands[0], XEXP (operands[1], 0));
- operands[1] = copy_rtx (operands[1]);
- XEXP (operands[1], 0) = operands[0];
}
else
- operands[1] = validize_mem (operands[1]);
+ {
+ operands[1] = force_const_mem (DImode, operands[1]);
+ if (reload_in_progress)
+ {
+ emit_move_insn (operands[0], XEXP (operands[1], 0));
+ operands[1] = copy_rtx (operands[1]);
+ XEXP (operands[1], 0) = operands[0];
+ }
+ else
+ operands[1] = validize_mem (operands[1]);
+ }
}
else
abort ();
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~1997-09-10 18:34 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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1997-09-09 14:53 More info on egcs alpha bug H.J. Lu
1997-09-10 10:51 ` Richard Henderson
1997-09-10 18:32 ` Richard Henderson
1997-09-10 18:34 ` Richard Henderson
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