From: Jeff Law <law@gcc.gnu.org>
Date: Tue, 28 Jul 1998 21:27:10 +0000 (-0600)
Subject: cse.c (cse_insn): Enable subsitution inside libcall only for REG, SUBREG, MEM.
X-Git-Tag: prereleases/egcs-1.1-prerelease~155
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cfe50c05d5614813a9531dd0b8087eed5355ec69;p=thirdparty%2Fgcc.git

cse.c (cse_insn): Enable subsitution inside libcall only for REG, SUBREG, MEM.

�
        * cse.c (cse_insn): Enable subsitution inside libcall only for REG,
        SUBREG, MEM.
        * rtlanal.c (replace_rtx): Prohibit replaces in CONST_DOUBLE.

From-SVN: r21446
---

diff --git a/gcc/cse.c b/gcc/cse.c
index 19e809a52dc4..5d121870afb0 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -6117,8 +6117,9 @@ record_jump_cond (code, mode, op0, op1, reversed_nonequality)
    Then install the new sources and destinations in the table
    of available values. 
 
-   If IN_LIBCALL_BLOCK is nonzero, don't record any equivalence made in
-   the insn.  */
+   If LIBCALL_INSN is nonzero, don't record any equivalence made in
+   the insn.  It means that INSN is inside libcall block.  In this
+   case LIBCALL_INSN is the corresponding insn with REG_LIBCALL. */
 
 /* Data on one SET contained in the instruction.  */
 
@@ -6948,7 +6949,10 @@ cse_insn (insn, libcall_insn)
 	      /* If we just made a substitution inside a libcall, then we
 		 need to make the same substitution in any notes attached
 		 to the RETVAL insn.  */
-	      if (libcall_insn)
+	      if (libcall_insn
+		  && (GET_CODE (old_src) == REG
+		      || GET_CODE (old_src) == SUBREG
+		      ||  GET_CODE (old_src) == MEM))
 		replace_rtx (REG_NOTES (libcall_insn), old_src, 
 			     canon_reg (SET_SRC (sets[i].rtl), insn));