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convert.c (strip_float_extensions): Look for narrowest type handling FP constants. 

* convert.c (strip_float_extensions):  Look for narrowest type handling
	FP constants.

	* fold-const.c (fold):  Fold (double)float1 CMP (double)float2 into
	float1 CMP float2.
	* convert.c (strip_float_extensions): Make global.
	* tree.h (strip_float_extensions): Declare.

	* gcc.dg/i386-fpcvt-1.c: New test.
	* gcc.dg/i386-fpcvt-2.c: New test.

From-SVN: r61279
This commit is contained in:
Jan Hubicka 2003-01-14 14:03:47 +01:00 committed by Jan Hubicka
parent ab5496c403
commit 77f9af81d2
8 changed files with 70 additions and 4 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
Tue Jan 14 00:45:33 CET 2003 Jan Hubicka <jh@suse.cz>
* convert.c (strip_float_extensions): Look for narrowest type handling
FP constants.
* fold-const.c (fold): Fold (double)float1 CMP (double)float2 into
float1 CMP float2.
* convert.c (strip_float_extensions): Make global.
* tree.h (strip_float_extensions): Declare.
2003-01-14 Gabriel Dos Reis <gdr@integrable-solutions.net>
* timevar.def: define TV_NAME_LOOKUP.

2
gcc/Makefile.in
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@ -1215,7 +1215,7 @@ c-objc-common.o : c-objc-common.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(
c-aux-info.o : c-aux-info.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) \
$(C_TREE_H) flags.h toplev.h
c-convert.o : c-convert.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) \
flags.h toplev.h $(C_COMMON_H)
flags.h toplev.h $(C_COMMON_H) real.h
c-pragma.o: c-pragma.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) $(TREE_H) \
function.h c-pragma.h toplev.h output.h $(GGC_H) $(TM_P_H) $(C_COMMON_H) gt-c-pragma.h
mbchar.o: mbchar.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) mbchar.h

26
gcc/convert.c
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@ -32,8 +32,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#include "convert.h"
#include "toplev.h"
#include "langhooks.h"
static tree strip_float_extensions PARAMS ((tree));
#include "real.h"
/* Convert EXPR to some pointer or reference type TYPE.
EXPR must be pointer, reference, integer, enumeral, or literal zero;
@ -75,12 +74,33 @@ convert_to_pointer (type, expr)
}
/* Avoid any floating point extensions from EXP. */
static tree
tree
strip_float_extensions (exp)
tree exp;
{
tree sub, expt, subt;
/* For floating point constant look up the narrowest type that can hold
it properly and handle it like (type)(narrowest_type)constant.
This way we can optimize for instance a=a*2.0 where "a" is float
but 2.0 is double constant. */
if (TREE_CODE (exp) == REAL_CST)
{
REAL_VALUE_TYPE orig;
tree type = NULL;
orig = TREE_REAL_CST (exp);
if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node)
&& exact_real_truncate (TYPE_MODE (float_type_node), &orig))
type = float_type_node;
else if (TYPE_PRECISION (TREE_TYPE (exp))
> TYPE_PRECISION (double_type_node)
&& exact_real_truncate (TYPE_MODE (double_type_node), &orig))
type = double_type_node;
if (type)
return build_real (type, real_value_truncate (TYPE_MODE (type), orig));
}
if (TREE_CODE (exp) != NOP_EXPR)
return exp;

12
gcc/fold-const.c
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@ -6041,6 +6041,18 @@ fold (expr)
if (FLOAT_TYPE_P (TREE_TYPE (arg0)))
{
tree targ0 = strip_float_extensions (arg0);
tree targ1 = strip_float_extensions (arg1);
tree newtype = TREE_TYPE (targ0);
if (TYPE_PRECISION (TREE_TYPE (targ1)) > TYPE_PRECISION (newtype))
newtype = TREE_TYPE (targ1);
/* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
if (TYPE_PRECISION (newtype) < TYPE_PRECISION (TREE_TYPE (arg0)))
return fold (build (code, type, convert (newtype, targ0),
convert (newtype, targ1)));
/* (-a) CMP (-b) -> b CMP a */
if (TREE_CODE (arg0) == NEGATE_EXPR
&& TREE_CODE (arg1) == NEGATE_EXPR)

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
Tue Jan 14 00:45:03 CET 2003 Jan Hubicka <jh@suse.cz>
* gcc.dg/i386-fpcvt-1.c: New test.
* gcc.dg/i386-fpcvt-2.c: New test.
2003-01-14 Eric Botcazou <ebotcazou@libertysurf.fr>
* gcc.dg/i386-mmx-3.c: New test.

8
gcc/testsuite/gcc.dg/i386-fpcvt-1.c Normal file
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@ -0,0 +1,8 @@
/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
/* { dg-options "-O2 -msse2 -march=athlon" } */
/* { dg-final { scan-assembler-not "cvtss2sd" } } */
float a,b;
main()
{
a=b*3.0;
}

8
gcc/testsuite/gcc.dg/i386-fpcvt-2.c Normal file
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@ -0,0 +1,8 @@
/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
/* { dg-options "-O2 -msse2 -march=athlon" } */
/* { dg-final { scan-assembler-not "cvtss2sd" } } */
float a,b;
main()
{
return a<0.0;
}

3
gcc/tree.h
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@ -2929,6 +2929,9 @@ extern tree fold_builtin PARAMS ((tree));
extern enum built_in_function builtin_mathfn_code PARAMS ((tree));
extern tree build_function_call_expr PARAMS ((tree, tree));
/* In convert.c */
extern tree strip_float_extensions PARAMS ((tree));
/* In alias.c */
extern void record_component_aliases PARAMS ((tree));
extern HOST_WIDE_INT get_alias_set PARAMS ((tree));