gcc/

	Better ISR prologues by supporting GASes __gcc_isr pseudo insn.
	PR target/20296
	PR target/81268
	* configure.ac [target=avr]: Add GAS check for -mgcc-isr.
	(HAVE_AS_AVR_MGCCISR_OPTION):  If so, AC_DEFINE it.
	* config.in: Regenerate.
	* configure: Regenerate.
	* doc/extend.texi (AVR Function Attributes) <no_gccisr>: Document it.
	* doc/invoke.texi (AVR Options) <-mgas-isr-prologues>: Document it.
	* config/avr/avr.opt (-mgas-isr-prologues): New option and...
	(TARGET_GASISR_PROLOGUES): ...target mask.
	* common/config/avr/avr-common.c
	(avr_option_optimization_table) [OPT_LEVELS_1_PLUS_NOT_DEBUG]:
	Set -mgas-isr-prologues.
	* config/avr/avr-passes.def (avr_pass_pre_proep): Add
	INSERT_PASS_BEFORE for it.
	* config/avr/avr-protos.h (make_avr_pass_pre_proep): New proto.
	* config/avr/avr.c (avr_option_override)
	[!HAVE_AS_AVR_MGCCISR_OPTION]: Unset TARGET_GASISR_PROLOGUES.
	(avr_no_gccisr_function_p, avr_hregs_split_reg): New static functions.
	(avr_attribute_table) <no_gccisr>: Add new function attribute.
	(avr_set_current_function) <is_no_gccisr>: Init machine field.
	(avr_pass_data_pre_proep, avr_pass_pre_proep): New pass data
	and rtl_opt_pass.
	(make_avr_pass_pre_proep): New function.
	(emit_push_sfr) <treg>: Add argument to function and use it
	instead of TMP_REG.
	(avr_expand_prologue) [machine->gasisr.maybe]: Emit gasisr insn
	and set machine->gasisr.yes.
	(avr_expand_epilogue) [machine->gasisr.yes]: Similar.
	(avr_asm_function_end_prologue) [machine->gasisr.yes]: Add
	__gcc_isr.n_pushed to .L__stack_usage.
	(TARGET_ASM_FINAL_POSTSCAN_INSN): Define to...
	(avr_asm_final_postscan_insn): ...this new static function.
	* config/avr/avr.h (machine_function)
	<is_no_gccisr, use_L__stack_usage>: New fields.
	<gasisr, gasisr.yes, gasisr.maybe, gasisr.regno>: New fields.
	* config/avr/avr.md (UNSPECV_GASISR): Add unspecv enum.
	(GASISR_Prologue, GASISR_Epilogue, GASISR_Done): New define_constants.
	(gasisr, *gasisr): New expander and insn.
	* config/avr/gen-avr-mmcu-specs.c (print_mcu)
	[HAVE_AS_AVR_MGCCISR_OPTION]: Print asm_gccisr spec.
	* config/avr/specs.h (ASM_SPEC) <asm_gccisr>: Add sub spec.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@250093 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 38 insertions, 0 deletions

diff --git a/gcc/configure b/gcc/configure
index 893f9587efa..98aa62c00be 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -24820,6 +24820,42 @@ $as_echo "#define HAVE_AS_AVR_MRMW_OPTION 1" >>confdefs.h
 fi
 
 
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for __gcc_isr pseudo instruction" >&5
+$as_echo_n "checking assembler for __gcc_isr pseudo instruction... " >&6; }
+if test "${gcc_cv_as_avr_mgccisr+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  gcc_cv_as_avr_mgccisr=no
+  if test x$gcc_cv_as != x; then
+    $as_echo '.text
+      		    __gcc_isr 1
+      		    __gcc_isr 2
+      		    __gcc_isr 0,r24
+      		   ' > conftest.s
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -mgcc-isr -o conftest.o conftest.s >&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+	gcc_cv_as_avr_mgccisr=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_avr_mgccisr" >&5
+$as_echo "$gcc_cv_as_avr_mgccisr" >&6; }
+if test $gcc_cv_as_avr_mgccisr = yes; then
+
+$as_echo "#define HAVE_AS_AVR_MGCCISR_OPTION 1" >>confdefs.h
+
+fi
+
+
     # Check how default linker description file implements .rodata for
     # avrxmega3 (PR21472).  avr-gcc assumes .rodata is *not* loaded to
     # RAM so avr-gcc skips __do_copy_data for .rodata objects.
@@ -25282,6 +25318,7 @@ $as_echo "#define HAVE_AS_SPARC5_VIS4 1" >>confdefs.h
 
 fi
 
+
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for SPARC6 instructions" >&5
 $as_echo_n "checking assembler for SPARC6 instructions... " >&6; }
 if test "${gcc_cv_as_sparc_sparc6+set}" = set; then :
@@ -25318,6 +25355,7 @@ $as_echo "#define HAVE_AS_SPARC6 1" >>confdefs.h
 
 fi
 
+
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for LEON instructions" >&5
 $as_echo_n "checking assembler for LEON instructions... " >&6; }
 if test "${gcc_cv_as_sparc_leon+set}" = set; then :