;;- Machine description for GNU compiler, ns32000 Version
;; Copyright (C) 1988, 1994 Free Software Foundation, Inc.
-;; Contributed by Michael Tiemann (tiemann@mcc.com)
+;; Contributed by Michael Tiemann (tiemann@cygnus.com)
;; This file is part of GNU CC.
return \"adjspb %$-4\";
}")
+;; The extsd/extd isntructions have the problem that they always access
+;; 32 bits even if the bitfield is smaller. For example the instruction
+;; extsd 7(r1),r0,2,5
+;; would read not only at address 7(r1) but also at 8(r1) to 10(r1).
+;; If these addresses are in a different (unmapped) page a memory fault
+;; is the result.
+;;
+;; Timing considerations:
+;; movd 0(r1),r0 3 bytes
+;; lshd -26,r0 4
+;; andd 0x1f,r0 5
+;; takes about 13 cycles on the 532 while
+;; extsd 7(r1),r0,2,5 5 bytes
+;; takes about 21 cycles.
+;;
+;; So lets forget about extsd/extd on the 532.
+
(define_insn ""
[(set (match_operand:SI 0 "general_operand" "=g<")
(zero_extract:SI (match_operand:SI 1 "register_operand" "g")
(match_operand:SI 2 "const_int_operand" "i")
(match_operand:SI 3 "general_operand" "rK")))]
- ""
+ "! TARGET_32532"
"*
{ if (GET_CODE (operands[3]) == CONST_INT)
return \"extsd %1,%0,%3,%2\";
(zero_extract:SI (match_operand:QI 1 "general_operand" "g")
(match_operand:SI 2 "const_int_operand" "i")
(match_operand:SI 3 "general_operand" "rK")))]
- ""
+ "! TARGET_32532"
"*
{ if (GET_CODE (operands[3]) == CONST_INT)
return \"extsd %1,%0,%3,%2\";