diff options
| author | Roger Sayle <roger@eyesopen.com> | 2003-01-15 17:44:37 +0000 |
|---|---|---|
| committer | Roger Sayle <roger@eyesopen.com> | 2003-01-15 17:44:37 +0000 |
| commit | e33f882dc6ddd166a6d2af6c7320a426cf7a4f84 (patch) | |
| tree | 14006c67570f18b885e7bad79e770d76cd577a4a /gcc/c-semantics.c | |
| parent | 2f601187831860826002434b1932925af74332da (diff) | |
* c-semantics.c (genrtl_while_stmt): Improve initial RTL generation
when loop condition is known true, i.e. "while (1) { ... }".
(genrtl_for_stmt): Similarly for "for" statements.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@61338 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/c-semantics.c')
| -rw-r--r-- | gcc/c-semantics.c | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/gcc/c-semantics.c b/gcc/c-semantics.c index 769c1165d4a..e19e73e47e8 100644 --- a/gcc/c-semantics.c +++ b/gcc/c-semantics.c @@ -1,7 +1,7 @@ /* This file contains the definitions and documentation for the common tree codes used in the GNU C and C++ compilers (see c-common.def for the standard codes). - Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc. + Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc. Written by Benjamin Chelf (chelf@codesourcery.com). This file is part of GCC. @@ -424,16 +424,20 @@ void genrtl_while_stmt (t) tree t; { - tree cond; + tree cond = WHILE_COND (t); + emit_nop (); emit_line_note (input_filename, lineno); expand_start_loop (1); genrtl_do_pushlevel (); - cond = expand_cond (WHILE_COND (t)); - emit_line_note (input_filename, lineno); - expand_exit_loop_top_cond (0, cond); - genrtl_do_pushlevel (); + if (cond && !integer_nonzerop (cond)) + { + cond = expand_cond (cond); + emit_line_note (input_filename, lineno); + expand_exit_loop_top_cond (0, cond); + genrtl_do_pushlevel (); + } expand_stmt (WHILE_BODY (t)); @@ -522,7 +526,7 @@ void genrtl_for_stmt (t) tree t; { - tree cond; + tree cond = FOR_COND (t); const char *saved_filename; int saved_lineno; @@ -539,7 +543,6 @@ genrtl_for_stmt (t) else expand_start_loop (1); genrtl_do_pushlevel (); - cond = expand_cond (FOR_COND (t)); /* Save the filename and line number so that we expand the FOR_EXPR we can reset them back to the saved values. */ @@ -547,12 +550,15 @@ genrtl_for_stmt (t) saved_lineno = lineno; /* Expand the condition. */ - emit_line_note (input_filename, lineno); - if (cond) - expand_exit_loop_top_cond (0, cond); + if (cond && !integer_nonzerop (cond)) + { + cond = expand_cond (cond); + emit_line_note (input_filename, lineno); + expand_exit_loop_top_cond (0, cond); + genrtl_do_pushlevel (); + } /* Expand the body. */ - genrtl_do_pushlevel (); expand_stmt (FOR_BODY (t)); /* Expand the increment expression. */ |