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sparc.h (ASM_DECLARE_REGISTER_GLOBAL): Document .register declaration. 

* config/sparc/sparc.h (ASM_DECLARE_REGISTER_GLOBAL): Document
	.register declaration. Don't use variables with __ prefixes.

From-SVN: r30810
This commit is contained in:
Jakub Jelinek 1999-12-06 20:53:38 +01:00 committed by David S. Miller
parent 1ba305b54c
commit 730f020764
2 changed files with 26 additions and 10 deletions
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3
gcc/ChangeLog
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@ -23,6 +23,9 @@
information after SUBREGs are eliminated by optimizations in
this pass if PROMOTE_FUNCTION_RETURN.
* config/sparc/sparc.h (ASM_DECLARE_REGISTER_GLOBAL): Document
.register declaration. Don't use variables with __ prefixes.
Mon Dec 6 12:24:52 1999 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* fold-const.c (optimize_bit_field_compare): Only use one mode

33
gcc/config/sparc/sparc.h
View File

@ -1834,25 +1834,38 @@ do { \
} while (0)
/* Output the special assembly code needed to tell the assembler some
register is used as global register variable. */
register is used as global register variable.
SPARC 64bit psABI declares registers %g2 and %g3 as application
registers and %g6 and %g7 as OS registers. Any object using them
should declare (for %g2/%g3 has to, for %g6/%g7 can) that it uses them
and how they are used (scratch or some global variable).
Linker will then refuse to link together objects which use those
registers incompatibly.
Unless the registers are used for scratch, two different global
registers cannot be declared to the same name, so in the unlikely
case of a global register variable occupying more than one register
we prefix the second and following registers with .gnu.part1. etc. */
extern char sparc_hard_reg_printed[8];
#ifdef HAVE_AS_REGISTER_PSEUDO_OP
#define ASM_DECLARE_REGISTER_GLOBAL(FILE, DECL, REGNO, NAME) \
do { \
if (TARGET_ARCH64) \
{ \
int __end = HARD_REGNO_NREGS ((REGNO), DECL_MODE (decl)) + (REGNO); \
int __reg; \
extern char sparc_hard_reg_printed[8]; \
for (__reg = (REGNO); __reg < 8 && __reg < __end; __reg++) \
if ((__reg & ~1) == 2 || (__reg & ~1) == 6) \
int end = HARD_REGNO_NREGS ((REGNO), DECL_MODE (decl)) + (REGNO); \
int reg; \
for (reg = (REGNO); reg < 8 && reg < end; reg++) \
if ((reg & ~1) == 2 || (reg & ~1) == 6) \
{ \
if (__reg == (REGNO)) \
fprintf ((FILE), "\t.register\t%%g%d, %s\n", __reg, (NAME)); \
if (reg == (REGNO)) \
fprintf ((FILE), "\t.register\t%%g%d, %s\n", reg, (NAME)); \
else \
fprintf ((FILE), "\t.register\t%%g%d, .gnu.part%d.%s\n", \
__reg, __reg - (REGNO), (NAME)); \
sparc_hard_reg_printed[__reg] = 1; \
reg, reg - (REGNO), (NAME)); \
sparc_hard_reg_printed[reg] = 1; \
} \
} \
} while (0)