2009-04-10 Chao-ying Fu <fu@mips.com>

	* doc/tm.texi (Instruction Output): Document
	TARGET_ASM_FINAL_POSTSCAN_INSN.
	* target.h (final_postscan_insn): New field in asm_out.
	* target-def.h (TARGET_ASM_FINAL_POSTSCAN_INSN): New define.
	(TARGET_ASM_OUT): Add TARGET_ASM_FINAL_POSTSCAN_INSN.
	* final.c (final_scan_insn): Call
	targetm.asm_out.final_postscan_insn after outputting
	an asm macro and a normal instruction.

	* config/mips/mips.h (FINAL_PRESCAN_INSN): New define.
	* config/mips/mips-protos.h (mips_final_prescan_insn): Declare.
	* config/mips/mips.c (mips_at_reg_p): New for_each_rtx callback.
	(mips_final_prescan_insn, mips_final_postscan_insn): New functions.
	(TARGET_ASM_FINAL_POSTSCAN_INSN): New define.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@145934 138bc75d-0d04-0410-961f-82ee72b054a4

8 files changed, 95 insertions, 1 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a77df07a6af..9965730d134 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,20 @@
+2009-04-10  Chao-ying Fu  <fu@mips.com>
+
+	* doc/tm.texi (Instruction Output): Document
+	TARGET_ASM_FINAL_POSTSCAN_INSN.
+	* target.h (final_postscan_insn): New field in asm_out.
+	* target-def.h (TARGET_ASM_FINAL_POSTSCAN_INSN): New define.
+	(TARGET_ASM_OUT): Add TARGET_ASM_FINAL_POSTSCAN_INSN.
+	* final.c (final_scan_insn): Call
+	targetm.asm_out.final_postscan_insn after outputting
+	an asm macro and a normal instruction.
+
+	* config/mips/mips.h (FINAL_PRESCAN_INSN): New define.
+	* config/mips/mips-protos.h (mips_final_prescan_insn): Declare.
+	* config/mips/mips.c (mips_at_reg_p): New for_each_rtx callback.
+	(mips_final_prescan_insn, mips_final_postscan_insn): New functions.
+	(TARGET_ASM_FINAL_POSTSCAN_INSN): New define.
+
 2009-04-10  Paolo Bonzini  <bonzini@gnu.org>
 
 	PR middle-end/39701
diff --git a/gcc/config/mips/mips-protos.h b/gcc/config/mips/mips-protos.h
index a704750286b..1f8054ede9c 100644
--- a/gcc/config/mips/mips-protos.h
+++ b/gcc/config/mips/mips-protos.h
@@ -333,5 +333,6 @@ extern void mips_expand_atomic_qihi (union mips_gen_fn_ptrs,
 extern void mips_expand_vector_init (rtx, rtx);
 
 extern bool mips_epilogue_uses (unsigned int);
+extern void mips_final_prescan_insn (rtx, rtx *, int);
 
 #endif /* ! GCC_MIPS_PROTOS_H */
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 9912105ecfa..0b51c78f576 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -14697,6 +14697,46 @@ mips_epilogue_uses (unsigned int regno)
 
   return false;
 }
+
+/* A for_each_rtx callback.  Stop the search if *X is an AT register.  */
+
+static int
+mips_at_reg_p (rtx *x, void *data ATTRIBUTE_UNUSED)
+{
+  return GET_CODE (*x) == REG && REGNO (*x) == AT_REGNUM;
+}
+
+
+/* Implement FINAL_PRESCAN_INSN.  */
+
+void
+mips_final_prescan_insn (rtx insn, rtx *opvec, int noperands)
+{
+  int i;
+
+  /* We need to emit ".set noat" before an instruction that accesses
+     $1 (AT).  */
+  if (recog_memoized (insn) >= 0)
+    for (i = 0; i < noperands; i++)
+      if (for_each_rtx (&opvec[i], mips_at_reg_p, NULL))
+	if (set_noat++ == 0)
+	  fprintf (asm_out_file, "\t.set\tnoat\n");
+}
+
+/* Implement TARGET_ASM_FINAL_POSTSCAN_INSN.  */
+
+void
+mips_final_postscan_insn (FILE *file, rtx insn, rtx *opvec, int noperands)
+{
+  int i;
+
+  /* Close any ".set noat" block opened by mips_final_prescan_insn.  */
+  if (recog_memoized (insn) >= 0)
+    for (i = 0; i < noperands; i++)
+      if (for_each_rtx (&opvec[i], mips_at_reg_p, NULL))
+	if (--set_noat == 0)
+	  fprintf (file, "\t.set\tat\n");
+}
 
 /* Initialize the GCC target structure.  */
 #undef TARGET_ASM_ALIGNED_HI_OP
@@ -14865,6 +14905,9 @@ mips_epilogue_uses (unsigned int regno)
 #undef TARGET_IRA_COVER_CLASSES
 #define TARGET_IRA_COVER_CLASSES mips_ira_cover_classes
 
+#undef TARGET_ASM_FINAL_POSTSCAN_INSN
+#define TARGET_ASM_FINAL_POSTSCAN_INSN mips_final_postscan_insn
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-mips.h"
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index fbcfdca61e9..45971acf08a 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -3459,3 +3459,6 @@ extern enum mips_code_readable_setting mips_code_readable;
 
 /* Enable querying of DFA units.  */
 #define CPU_UNITS_QUERY 1
+
+#define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS)	\
+  mips_final_prescan_insn (INSN, OPVEC, NOPERANDS)
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 665b2693e2f..0396a706cf7 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -8193,6 +8193,19 @@ writing conditional output routines in those patterns.
 If this macro is not defined, it is equivalent to a null statement.
 @end defmac
 
+@deftypefn {Target Hook} void TARGET_ASM_FINAL_POSTSCAN_INSN (FILE *@var{FILE}, rtx @var{insn}, rtx *@var{opvec}, int @var{noperands})
+If defined, this target hook is a function which is executed just after the
+output of assembler code for @var{insn}, to change the mode of the assembler
+if necessary.
+
+Here the argument @var{opvec} is the vector containing the operands
+extracted from @var{insn}, and @var{noperands} is the number of
+elements of the vector which contain meaningful data for this insn.
+The contents of this vector are what was used to convert the insn
+template into assembler code, so you can change the assembler mode
+by checking the contents of the vector.
+@end deftypefn
+
 @defmac PRINT_OPERAND (@var{stream}, @var{x}, @var{code})
 A C compound statement to output to stdio stream @var{stream} the
 assembler syntax for an instruction operand @var{x}.  @var{x} is an
diff --git a/gcc/final.c b/gcc/final.c
index 1735a73207d..32d6b74e8f1 100644
--- a/gcc/final.c
+++ b/gcc/final.c
@@ -2235,6 +2235,10 @@ final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED,
 #endif
 	      }
 
+	    if (targetm.asm_out.final_postscan_insn)
+	      targetm.asm_out.final_postscan_insn (file, insn, ops,
+						   insn_noperands);
+
 	    this_is_asm_operands = 0;
 	    break;
 	  }
@@ -2637,6 +2641,12 @@ final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED,
 	/* Output assembler code from the template.  */
 	output_asm_insn (templ, recog_data.operand);
 
+	/* Some target machines need to postscan each insn after
+	   it is output.  */
+	if (targetm.asm_out.final_postscan_insn)
+	  targetm.asm_out.final_postscan_insn (file, insn, recog_data.operand,
+					       recog_data.n_operands);
+
 	/* If necessary, report the effect that the instruction has on
 	   the unwind info.   We've already done this for delay slots
 	   and call instructions.  */
diff --git a/gcc/target-def.h b/gcc/target-def.h
index e19cde3f0a2..9e6693bbb88 100644
--- a/gcc/target-def.h
+++ b/gcc/target-def.h
@@ -236,6 +236,10 @@
 #define TARGET_ASM_OUTPUT_DWARF_DTPREL NULL
 #endif
 
+#ifndef TARGET_ASM_FINAL_POSTSCAN_INSN
+#define TARGET_ASM_FINAL_POSTSCAN_INSN NULL
+#endif
+
 #ifndef TARGET_ASM_RECORD_GCC_SWITCHES
 #define TARGET_ASM_RECORD_GCC_SWITCHES NULL
 #endif
@@ -291,7 +295,8 @@
 			TARGET_ASM_RECORD_GCC_SWITCHES,		\
 			TARGET_ASM_RECORD_GCC_SWITCHES_SECTION,	\
 			TARGET_ASM_OUTPUT_ANCHOR,		\
-			TARGET_ASM_OUTPUT_DWARF_DTPREL}
+			TARGET_ASM_OUTPUT_DWARF_DTPREL,		\
+			TARGET_ASM_FINAL_POSTSCAN_INSN}
 
 /* Scheduler hooks.  All of these default to null pointers, which
    haifa-sched.c looks for and handles.  */
diff --git a/gcc/target.h b/gcc/target.h
index 4fb379465cf..a520e1c5765 100644
--- a/gcc/target.h
+++ b/gcc/target.h
@@ -245,6 +245,8 @@ struct gcc_target
     /* Output a DTP-relative reference to a TLS symbol.  */
     void (*output_dwarf_dtprel) (FILE *file, int size, rtx x);
 
+    /* Some target machines need to postscan each insn after it is output.  */
+    void (*final_postscan_insn) (FILE *, rtx, rtx *, int);
   } asm_out;
 
   /* Functions relating to instruction scheduling.  */