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* config/sparc/sparc.md (UNSPEC_FRAME_BLOCKAGE): New constant.
[pf3gnuchains/gcc-fork.git] / gcc / config / sparc / sparc.md
index 37ac170..f67ee83 100644 (file)
@@ -28,6 +28,7 @@
   [(UNSPEC_MOVE_PIC            0)
    (UNSPEC_UPDATE_RETURN       1)
    (UNSPEC_LOAD_PCREL_SYM      2)
+   (UNSPEC_FRAME_BLOCKAGE      3)
    (UNSPEC_MOVE_PIC_LABEL      5)
    (UNSPEC_SETH44              6)
    (UNSPEC_SETM44              7)
   ""
   [(set_attr "length" "0")])
 
+;; Do not schedule instructions accessing memory before this point.
+
+(define_expand "frame_blockage"
+  [(set (match_dup 0)
+       (unspec:BLK [(match_dup 1)] UNSPEC_FRAME_BLOCKAGE))]
+  ""
+{
+  operands[0] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode));
+  MEM_VOLATILE_P (operands[0]) = 1;
+  operands[1] = stack_pointer_rtx;
+})
+
+(define_insn "*frame_blockage<P:mode>"
+  [(set (match_operand:BLK 0 "" "")
+       (unspec:BLK [(match_operand:P 1 "" "")] UNSPEC_FRAME_BLOCKAGE))]
+  ""
+  ""
+  [(set_attr "length" "0")])
+
 (define_expand "probe_stack"
   [(set (match_operand 0 "memory_operand" "") (const_int 0))]
   ""