re PR rtl-optimization/7702 (gcc-3.2 optimization problem on a DEC alpha under OSF1)

        PR optimization/7702
        * reload1.c (reload_cse_simplify_set): Honor
        CLASS_CANNOT_CHANGE_MODE_P.

From-SVN: r62922

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7b3ae10ab0a11d4e10231bed98e23a0bde7ce4be..799530225822e3aa4bb86e6ca33eedfa331a7fd6 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2003-02-14  Falk Hueffner  <falk.hueffner@student.uni-tuebingen.de>
+
+       PR optimization/7702
+       * reload1.c (reload_cse_simplify_set): Honor
+       CLASS_CANNOT_CHANGE_MODE_P.
+
 2003-02-13  John David Anglin  <dave.anglin@nrc-crnc.gc.ca>
 
        * inclhack.def (hpux_long_double): Tighten select and add bypass
@@ -45,7 +51,7 @@
        as a SET pattern.
        
 2003-02-10  Eric Botcazou  <ebotcazou@libertysurf.fr>
-            Christian Ehrhardt  <ehrhardt@mathematik.uni-ulm.de>
+           Christian Ehrhardt  <ehrhardt@mathematik.uni-ulm.de>
 
        PR c/7741
        * c-decl.c (duplicate_decls): Discard the initializer of the
@@ -63,7 +69,7 @@
        * pa.md (jump): Likewise.
 
 2003-02-06  Eric Botcazou <ebotcazou@libertysurf.fr>
-            Richard Henderson <rth@redhat.com>
+           Richard Henderson <rth@redhat.com>
     
        PR c/9530
        * config/i386/i386.h (FUNCTION_OK_FOR_SIBCALL): Forbid sibcalls
@@ -116,43 +122,43 @@
 
        2002-09-16  Richard Henderson  <rth@redhat.com>
 
-        * emit-rtl.c (set_mem_attributes_minus_bitpos): Adjust SIZE
-        as well as OFFSET for BITPOS.
+       * emit-rtl.c (set_mem_attributes_minus_bitpos): Adjust SIZE
+       as well as OFFSET for BITPOS.
 
        2002-09-08  Jan Hubicka  <jh@suse.cz>
 
-        * emit-rtl.c (set_mem_attributes_minus_bitpos): Fix array_ref
-        handling.
+       * emit-rtl.c (set_mem_attributes_minus_bitpos): Fix array_ref
+       handling.
 
        2002-07-29  Richard Henderson  <rth@redhat.com>
 
-        * emit-rtl.c (set_mem_attributes_minus_bitpos): Rename from
-        set_mem_attributes and add BITPOS argument.  Subtract it from
-        OFFSET when same is adjusted.
-        (set_mem_attributes): New wrapper function.
-        * expr.c (expand_assignment): Use set_mem_attributes_minus_bitpos;
-        remove offset adjustment hack.
-        * expr.h (set_mem_attributes_minus_bitpos): Declare.
+       * emit-rtl.c (set_mem_attributes_minus_bitpos): Rename from
+       set_mem_attributes and add BITPOS argument.  Subtract it from
+       OFFSET when same is adjusted.
+       (set_mem_attributes): New wrapper function.
+       * expr.c (expand_assignment): Use set_mem_attributes_minus_bitpos;
+       remove offset adjustment hack.
+       * expr.h (set_mem_attributes_minus_bitpos): Declare.
 
        2002-07-25  Richard Henderson  <rth@redhat.com>
 
-        * emit-rtl.c (set_mem_attributes): Fix size and alignment thinkos
-        in ARRAY_REF of DECL_P case.
+       * emit-rtl.c (set_mem_attributes): Fix size and alignment thinkos
+       in ARRAY_REF of DECL_P case.
 
        2002-07-21  Richard Henderson  <rth@redhat.com>
 
-        * emit-rtl.c (set_mem_attributes): Preserve indirection of PARM_DECL
-        when flag_argument_noalias == 2.
-        * alias.c (nonoverlapping_memrefs_p): Handle that.
-        * print-rtl.c (print_mem_expr): Likewise.
+       * emit-rtl.c (set_mem_attributes): Preserve indirection of PARM_DECL
+       when flag_argument_noalias == 2.
+       * alias.c (nonoverlapping_memrefs_p): Handle that.
+       * print-rtl.c (print_mem_expr): Likewise.
 
        2002-06-03  Dan Nicolaescu  <dann@godzilla.ics.uci.edu>
 
-        * alias.c (nonoverlapping_memrefs_p): Fix off by one error.
+       * alias.c (nonoverlapping_memrefs_p): Fix off by one error.
 
 2003-02-03  Steve Ellcey  <sje@cup.hp.com>
 
-        * config/pa/pa64-hpux.h (INIT_ENVIRONMENT): New.
+       * config/pa/pa64-hpux.h (INIT_ENVIRONMENT): New.
 
 2003-02-01  Jakub Jelinek  <jakub@redhat.com>
 
@@ -174,13 +180,13 @@
 
        * config/m68k/m68k.md (tablejump+2): Don't sign extend an address
        register.
-        * config/m68k/apollo68.h (ASM_RETURN_CASE_JUMP): Likewise.
-        * config/m68k/coff.h (ASM_RETURN_CASE_JUMP): Likewise.
-        * config/m68k/linux.h (ASM_RETURN_CASE_JUMP): Likewise.
-        * config/m68k/m68kelf.h (ASM_RETURN_CASE_JUMP): Likewise.
-        * config/m68k/mot3300.h (ASM_RETURN_CASE_JUMP): Likewise.
-        * config/m68k/netbsd-elf.h (ASM_RETURN_CASE_JUMP): Likewise.
-        * config/m68k/pbb.h (ASM_RETURN_CASE_JUMP): Likewise.
+       * config/m68k/apollo68.h (ASM_RETURN_CASE_JUMP): Likewise.
+       * config/m68k/coff.h (ASM_RETURN_CASE_JUMP): Likewise.
+       * config/m68k/linux.h (ASM_RETURN_CASE_JUMP): Likewise.
+       * config/m68k/m68kelf.h (ASM_RETURN_CASE_JUMP): Likewise.
+       * config/m68k/mot3300.h (ASM_RETURN_CASE_JUMP): Likewise.
+       * config/m68k/netbsd-elf.h (ASM_RETURN_CASE_JUMP): Likewise.
+       * config/m68k/pbb.h (ASM_RETURN_CASE_JUMP): Likewise.
 
 2003-01-30  Ralf Corsepius  <corsepiu@faw.uni-ulm.de>
 
@@ -267,8 +273,8 @@
 
 2003-01-27  Richard Earnshaw <rearnsha@arm.com>
        
-        * function.c (purge_addressof_1): After pushing anaddressed register
-         onto the stack, simplify the result.
+       * function.c (purge_addressof_1): After pushing anaddressed register
+        onto the stack, simplify the result.
        
 2003-01-25  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
@@ -285,7 +291,7 @@
        of *both* the file name and the fix name.
 
 2003-01-25  Eric Botcazou  <ebotcazou@libertysurf.fr>
-            Christian Ehrhardt  <ehrhardt@mathematik.uni-ulm.de>
+           Christian Ehrhardt  <ehrhardt@mathematik.uni-ulm.de>
 
        PR optimization/9279
 
@@ -412,7 +418,7 @@
        binary compatibility.
 
 2003-01-07  Benjamin Kosnik  <bkoz@redhat.com>
-            Sunil Davasam  <sunil.k.davasam@intel.com>
+           Sunil Davasam  <sunil.k.davasam@intel.com>
 
        PR libstdc++/9076 
        * unwind-dw2.c (execute_cfa_program): DW_CFA_undefined,
@@ -732,12 +738,12 @@ Sat Nov 16 02:54:29 CET 2002  Jan Hubicka  <jh@suse.cz>
 
 2002-11-04  Aldy Hernandez  <aldyh@redhat.com>
 
-        Backport patch to fix PR c/8451.
+       Backport patch to fix PR c/8451.
 
-        2002-04-25  Richard Henderson  <rth@redhat.com>
+       2002-04-25  Richard Henderson  <rth@redhat.com>
 
-        * expmed.c (extract_bit_field): Fall through to generic code rather
-        than aborting on subreg special case.
+       * expmed.c (extract_bit_field): Fall through to generic code rather
+       than aborting on subreg special case.
 
 2002-11-01  Mark Mitchell  <mark@codesourcery.com>
 

diff --git a/gcc/reload1.c b/gcc/reload1.c
index 5928a6806661f500a0cecee9aa6da927efe10213..a37a050fd970fcdac393ee00f69631c069127813 100644 (file)
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -8277,7 +8277,14 @@ reload_cse_simplify_set (set, insn)
        {
 #ifdef LOAD_EXTEND_OP
          if (GET_MODE_BITSIZE (GET_MODE (SET_DEST (set))) < BITS_PER_WORD
-             && extend_op != NIL)
+             && extend_op != NIL
+#ifdef CLASS_CANNOT_CHANGE_MODE
+             && !(REGNO_REG_CLASS (REGNO (SET_DEST (set)))
+                  == CLASS_CANNOT_CHANGE_MODE
+                  && CLASS_CANNOT_CHANGE_MODE_P (GET_MODE (SET_DEST (set)),
+                                                 word_mode))
+#endif
+             )
            {
              rtx wide_dest = gen_rtx_REG (word_mode, REGNO (SET_DEST (set)));
              ORIGINAL_REGNO (wide_dest) = ORIGINAL_REGNO (SET_DEST (set));