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Fix alpha-linux core dump reported by H.J. Lu. 

* alpha/alpha.h (PREFERRED_RELOAD_CLASS): Return NO_REGS if NO_REGS
	is passed in.
	* emit-rtl.c (gen_lowpart_common): Add code to convert CONST_INT to
	SFmode for 64 bit hosts.

From-SVN: r15035
This commit is contained in:
Jim Wilson 1997-09-02 19:37:05 +00:00 committed by Jim Wilson
parent a94729bc72
commit a6a503ed40
3 changed files with 28 additions and 1 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
Tue Sep 2 12:00:36 1997 Jim Wilson <wilson@cygnus.com>
* alpha/alpha.h (PREFERRED_RELOAD_CLASS): Return NO_REGS if NO_REGS
is passed in.
* emit-rtl.c (gen_lowpart_common): Add code to convert CONST_INT to
SFmode for 64 bit hosts.
Tue Sep 2 13:42:38 1997 Paul N. Hilfinger <hilfingr@CS.Berkeley.EDU>
* fixincludes: Permits spaces between # and define. Discard C++

2
gcc/config/alpha/alpha.h
View File

@ -691,7 +691,7 @@ enum reg_class { NO_REGS, GENERAL_REGS, FLOAT_REGS, ALL_REGS,
#define PREFERRED_RELOAD_CLASS(X, CLASS) \
(CONSTANT_P (X) && (X) != const0_rtx && (X) != CONST0_RTX (GET_MODE (X)) \
? ((CLASS) == FLOAT_REGS ? NO_REGS : GENERAL_REGS) \
? ((CLASS) == FLOAT_REGS || (CLASS) == NO_REGS ? NO_REGS : GENERAL_REGS)\
: (CLASS))
/* Loading and storing HImode or QImode values to and from memory

20
gcc/emit-rtl.c
View File

@ -809,6 +809,26 @@ gen_lowpart_common (mode, x)
return CONST_DOUBLE_FROM_REAL_VALUE (u.d, mode);
}
#endif
/* We need an extra case for machines where HOST_BITS_PER_WIDE_INT is the
same as sizeof (double), such as the alpha. We only handle the
REAL_ARITHMETIC case, which is easy. Testing HOST_BITS_PER_WIDE_INT
is not strictly necessary, but is done to restrict this code to cases
where it is known to work. */
#ifdef REAL_ARITHMETIC
else if (mode == SFmode
&& GET_CODE (x) == CONST_INT
&& GET_MODE_BITSIZE (mode) * 2 == HOST_BITS_PER_WIDE_INT)
{
REAL_VALUE_TYPE r;
HOST_WIDE_INT i;
i = INTVAL (x);
r = REAL_VALUE_FROM_TARGET_SINGLE (i);
return CONST_DOUBLE_FROM_REAL_VALUE (r, mode);
}
#endif
/* Similarly, if this is converting a floating-point value into a
single-word integer. Only do this is the host and target parameters are
compatible. */