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| author | Dhananjay R. Deshpande <dhananjayd@kpit.com> | 2002-06-14 11:06:38 +0000 |
|---|---|---|
| committer | Joern Rennecke <amylaar@gcc.gnu.org> | 2002-06-14 12:06:38 +0100 |
| commit | 03b8ec294f34655d06758e7f65c2c57604632e38 (patch) | |
| tree | 8c275a1c4955e42e791a15ea109f2cdcb2159a13 | |
| parent | 8e831557e4de285a788d4c80ce0d2139c2a3125e (diff) | |
| download | gcc-03b8ec294f34655d06758e7f65c2c57604632e38.tar.gz | |
sh.h: Define HARD_REGNO_RENAME_OK
Fri Jun 14 12:04:02 2002 Dhananjay R. Deshpande <dhananjayd@kpit.com>
* sh.h: Define HARD_REGNO_RENAME_OK
* sh.c: sh_hard_regno_rename_ok: New. If current function has
interrupt_handler attribute, only registers saved on stack are OK.
* sh-protos.h: Declare sh_hard_regno_rename_ok.
From-SVN: r54612
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/config/sh/sh-protos.h | 1 | ||||
| -rw-r--r-- | gcc/config/sh/sh.c | 20 | ||||
| -rw-r--r-- | gcc/config/sh/sh.h | 6 |
4 files changed, 34 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6176f689856..d5d900f801e 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +Fri Jun 14 12:04:02 2002 Dhananjay R. Deshpande <dhananjayd@kpit.com> + + * sh.h: Define HARD_REGNO_RENAME_OK + * sh.c: sh_hard_regno_rename_ok: New. If current function has + interrupt_handler attribute, only registers saved on stack are OK. + * sh-protos.h: Declare sh_hard_regno_rename_ok. + 2002-06-14 Kaz Kojima <kkojima@gcc.gnu.org> * config/sh/sh.md (jump): Emit jump insn. diff --git a/gcc/config/sh/sh-protos.h b/gcc/config/sh/sh-protos.h index 6abdfe6258d..3503f57948a 100644 --- a/gcc/config/sh/sh-protos.h +++ b/gcc/config/sh/sh-protos.h @@ -122,6 +122,7 @@ extern int sh_need_epilogue PARAMS ((void)); extern int initial_elimination_offset PARAMS ((int, int)); extern int fldi_ok PARAMS ((void)); extern int sh_pr_n_sets PARAMS ((void)); +extern int sh_hard_regno_rename_ok PARAMS ((unsigned int, unsigned int)); #ifdef HARD_CONST extern void fpscr_set_from_mem PARAMS ((int, HARD_REG_SET)); diff --git a/gcc/config/sh/sh.c b/gcc/config/sh/sh.c index a9c2e8250a4..22851372405 100644 --- a/gcc/config/sh/sh.c +++ b/gcc/config/sh/sh.c @@ -6701,6 +6701,26 @@ sh_can_redirect_branch (branch1, branch2) return 0; } +/* Return non-zero if register old_reg can be renamed to register new_reg. */ +int +sh_hard_regno_rename_ok (old_reg, new_reg) + unsigned int old_reg ATTRIBUTE_UNUSED; + unsigned int new_reg; +{ + +/* Interrupt functions can only use registers that have already been + saved by the prologue, even if they would normally be + call-clobbered. */ + + if ((lookup_attribute ("interrupt_handler", + DECL_ATTRIBUTES (current_function_decl)) + != NULL_TREE) + && !regs_ever_live[new_reg]) + return 0; + + return 1; +} + /* A C statement (sans semicolon) to update the integer variable COST based on the relationship between INSN that is dependent on DEP_INSN through the dependence LINK. The default is to make no diff --git a/gcc/config/sh/sh.h b/gcc/config/sh/sh.h index fef996a8f12..6891fd0758b 100644 --- a/gcc/config/sh/sh.h +++ b/gcc/config/sh/sh.h @@ -942,6 +942,12 @@ extern char sh_additional_register_names[ADDREGNAMES_SIZE] \ && (GET_MODE_SIZE (MODE2) <= 4)) \ : ((MODE1) != SFmode && (MODE2) != SFmode)))) +/* A C expression that is nonzero if hard register NEW_REG can be + considered for use as a rename register for OLD_REG register */ + +#define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \ + sh_hard_regno_rename_ok (OLD_REG, NEW_REG) + /* Specify the registers used for certain standard purposes. The values of these macros are register numbers. */ |