regmove.c (optimize_reg_copy_1): Do not replace a hard register in an asm.

	* regmove.c (optimize_reg_copy_1): Do not replace a hard register
	in an asm.

From-SVN: r63270

gcc/ChangeLog

+2003-02-22  Hans-Peter Nilsson  <hp@axis.com>
+
+	* regmove.c (optimize_reg_copy_1): Do not replace a hard register
+	in an asm.
+
 2003-02-21  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* Makefile.in (ggc-common.o): Depend on $(PARAMS_H)

gcc/regmove.c

@@ -433,6 +433,16 @@ optimize_reg_copy_1 (insn, dest, src)
 	continue;
 
       if (reg_set_p (src, p) || reg_set_p (dest, p)
+	  /* If SRC is an asm-declared register, it must not be replaced
+	     in any asm.  Unfortunately, the REG_EXPR tree for the asm
+	     variable may be absent in the SRC rtx, so we can't check the
+	     actual register declaration easily (the asm operand will have
+	     it, though).  To avoid complicating the test for a rare case,
+	     we just don't perform register replacement for a hard reg
+	     mentioned in an asm.  */
+	  || (sregno < FIRST_PSEUDO_REGISTER
+	      && asm_noperands (PATTERN (p)) >= 0
+	      && reg_overlap_mentioned_p (src, PATTERN (p)))
 	  /* Don't change a USE of a register.  */
 	  || (GET_CODE (PATTERN (p)) == USE
 	      && reg_overlap_mentioned_p (src, XEXP (PATTERN (p), 0))))