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| author | Jakub Jelinek <jakub@redhat.com> | 2002-04-28 21:47:12 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2002-04-28 21:47:12 +0200 |
| commit | a20fd5ac2eb9316dd87135ceb445702dc4d78aa2 (patch) | |
| tree | ea8960f1f233199a802a603713111bcde03517c8 /gcc/reload1.c | |
| parent | 87ed109f1f7fab7afc05afca460523a2493c0f43 (diff) | |
| download | gcc-a20fd5ac2eb9316dd87135ceb445702dc4d78aa2.zip gcc-a20fd5ac2eb9316dd87135ceb445702dc4d78aa2.tar.gz gcc-a20fd5ac2eb9316dd87135ceb445702dc4d78aa2.tar.bz2 | |
re PR rtl-optimization/6475 (zlib miscompilation with gcc-3.1)
PR optimization/6475
* reload1.c (alter_reg): Only call set_mem_expr if I is home pseudo
register of REGNO_DECL (i).
* Makefile.in (reload1.o): Add $(TREE_H).
* gcc.dg/20020426-2.c: New test.
From-SVN: r52855
Diffstat (limited to 'gcc/reload1.c')
| -rw-r--r-- | gcc/reload1.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index cf807af..840b1cb 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -41,6 +41,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "real.h" #include "toplev.h" #include "except.h" +#include "tree.h" /* This file contains the reload pass of the compiler, which is run after register allocation has been done. It checks that @@ -2067,10 +2068,19 @@ alter_reg (i, from_reg) memory. If this is a shared MEM, make a copy. */ if (REGNO_DECL (i)) { - if (from_reg != -1 && spill_stack_slot[from_reg] == x) - x = copy_rtx (x); + rtx decl = DECL_RTL_IF_SET (REGNO_DECL (i)); - set_mem_expr (x, REGNO_DECL (i)); + /* We can do this only for the DECLs home pseudo, not for + any copies of it, since otherwise when the stack slot + is reused, nonoverlapping_memrefs_p might think they + cannot overlap. */ + if (decl && GET_CODE (decl) == REG && REGNO (decl) == (unsigned) i) + { + if (from_reg != -1 && spill_stack_slot[from_reg] == x) + x = copy_rtx (x); + + set_mem_expr (x, REGNO_DECL (i)); + } } /* Save the stack slot for later. */ |