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| author | Jie Zhang <jie@codesourcery.com> | 2011-02-23 00:25:34 +0000 |
|---|---|---|
| committer | Jie Zhang <jiez@gcc.gnu.org> | 2011-02-23 00:25:34 +0000 |
| commit | b152a6158e401ee9e3752b4403deadd91aec2418 (patch) | |
| tree | 58283904211d9cd8de222354920fd228773d69d3 /gcc | |
| parent | 9f1a8175737ce26b3b52b54fa6831cfaae692eb5 (diff) | |
| download | gcc-b152a6158e401ee9e3752b4403deadd91aec2418.zip gcc-b152a6158e401ee9e3752b4403deadd91aec2418.tar.gz gcc-b152a6158e401ee9e3752b4403deadd91aec2418.tar.bz2 | |
re PR rtl-optimization/47763 (Useless initialization of register)
PR rtl-optimization/47763
* web.c (web_main): Ignore naked clobber when replacing register.
testsuite/
PR rtl-optimization/47763
* gcc.dg/pr47763.c: New test.
From-SVN: r170422
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr47763.c | 9 | ||||
| -rw-r--r-- | gcc/web.c | 12 |
4 files changed, 30 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 62c848b..c003c6f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2011-02-23 Jie Zhang <jie@codesourcery.com> + + PR rtl-optimization/47763 + * web.c (web_main): Ignore naked clobber when replacing register. + 2011-02-22 Anatoly Sokolov <aesok@post.ru> * config/stormy16/stormy16.h (REG_OK_FOR_BASE_P, REG_OK_FOR_INDEX_P): diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 14df266..aa53085 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2011-02-23 Jie Zhang <jie@codesourcery.com> + + PR rtl-optimization/47763 + * gcc.dg/pr47763.c: New test. + 2011-02-22 Paul Thomas <pault@gcc.gnu.org> PR fortran/45743 diff --git a/gcc/testsuite/gcc.dg/pr47763.c b/gcc/testsuite/gcc.dg/pr47763.c new file mode 100644 index 0000000..a5da2de --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr47763.c @@ -0,0 +1,9 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -funroll-loops -fdump-rtl-web" } */ + +foo() +{ +} + +/* { dg-final { scan-rtl-dump-not "Web oldreg" "web" } } */ +/* { dg-final { cleanup-rtl-dump "web" } } */ @@ -377,7 +377,17 @@ web_main (void) FOR_BB_INSNS (bb, insn) { unsigned int uid = INSN_UID (insn); - if (NONDEBUG_INSN_P (insn)) + + if (NONDEBUG_INSN_P (insn) + /* Ignore naked clobber. For example, reg 134 in the second insn + of the following sequence will not be replaced. + + (insn (clobber (reg:SI 134))) + + (insn (set (reg:SI 0 r0) (reg:SI 134))) + + Thus the later passes can optimize them away. */ + && GET_CODE (PATTERN (insn)) != CLOBBER) { df_ref *use_rec; df_ref *def_rec; |