stmt.c (expand_asm_operands): Invoke MD_ASM_CLOBBERS if present.

        * stmt.c (expand_asm_operands): Invoke MD_ASM_CLOBBERS if present.
        * tm.texi (MD_ASM_CLOBBERS): Document it.

From-SVN: r29064

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6a4fbea..e73dd7d 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,28 @@
+Thu Sep  2 13:00:48 1999  Richard Henderson  <rth@cygnus.com>
+
+       * stmt.c (expand_asm_operands): Invoke MD_ASM_CLOBBERS if present.
+       * tm.texi (MD_ASM_CLOBBERS): Document it.
+
+Thu Sep  2 10:22:40 1999  Richard Henderson  <rth@cygnus.com>
+
+       * dwarf2out.c (dwarf2out_line): Constify `lastfile'.
+       * except.c (expand_rethrow): Remove unused variable.
+       * expr.c (do_jump_by_parts_greater_rtx): Likewise.
+       * flow.c (replace_insns): Likewise.
+       (create_edge_list, verify_edge_list): Likewise.
+       * gcse.c (cprop_cc0_jump): Protect declaration with HAVE_cc0.
+
+       * genemit.c (gen_expand): Only emit `operands[N]' decl if there
+       is special code to run.
+       (main): Don't define operands to emit_operand.
+       * genrecog.c (main): Don't emit an empty peephole2_insn function.
+
+       * rtl.h (NOTE_BASIC_BLOCK): Use X0BBDEF.
+
+       * alpha/alpha.h (normal_memory_operand): Declare.
+       (reg_no_subreg_operand): Declare.
+       * alpha/elf.h (ASM_DECLARE_OBJECT_NAME): Use HOST_WIDE_INT_PRINT_DEC.
+
 Thu Sep  2 10:19:20 1999  Richard Henderson  <rth@cygnus.com>
 
        * c-parse.in (compstmt_primary_start): New, broken out of first

diff --git a/gcc/stmt.c b/gcc/stmt.c
index 97afc4e..f0548b4 100644 (file)
--- a/gcc/stmt.c
+++ b/gcc/stmt.c
@@ -1153,6 +1153,14 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
       return;
     }
 
+#ifdef MD_ASM_CLOBBERS
+  /* Sometimes we wish to automatically clobber registers across an asm.
+     Case in point is when the i386 backend moved from cc0 to a hard reg --
+     maintaining source-level compatability means automatically clobbering
+     the flags register.  */
+  MD_ASM_CLOBBERS (clobbers);
+#endif
+
   /* Count the number of meaningful clobbered registers, ignoring what
      we would ignore later.  */
   nclobbers = 0;

diff --git a/gcc/tm.texi b/gcc/tm.texi
index 8375908..eab7b2e 100644 (file)
--- a/gcc/tm.texi
+++ b/gcc/tm.texi
@@ -7713,6 +7713,11 @@ unit may not be bound to undefined symbols in another translation unit
 without user intervention.  For instance, under Microsoft Windows
 symbols must be explicitly imported from shared libraries (DLLs).
 
+@findex MD_ASM_CLOBBERS
+@item MD_ASM_CLOBBERS
+A C statement that adds to @var{CLOBBERS} @code{STRING_CST} trees for
+any hard regs the port wishes to automatically clobber for all asms.
+
 @findex ISSUE_RATE
 @item ISSUE_RATE
 A C expression that returns how many instructions can be issued at the