diff options
| author | Richard Biener <rguenther@suse.de> | 2021-10-04 14:24:07 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-10-04 18:02:57 +0200 |
| commit | d362b91fa655fb02a4214e28eb33b8b60a0e1ace (patch) | |
| tree | cc0da9ed36568e2d8c1f7b22fea381464ace92f1 /gcc | |
| parent | c86a16b07b76604a8e3d556f135babab80e2b747 (diff) | |
| download | gcc-d362b91fa655fb02a4214e28eb33b8b60a0e1ace.zip gcc-d362b91fa655fb02a4214e28eb33b8b60a0e1ace.tar.gz gcc-d362b91fa655fb02a4214e28eb33b8b60a0e1ace.tar.bz2 | |
avoid hardreg autoinit
This avoids initializating "uninitialized" hardregs like SP.
2021-10-04 Richard Biener <rguenther@suse.de>
* gimplify.c (is_var_need_auto_init): DECL_HARD_REGISTER
variables are not to be initialized.
* gcc.dg/auto-init-hardreg-1.c: New testcase.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/gimplify.c | 2 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/auto-init-hardreg-1.c | 9 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gcc/gimplify.c b/gcc/gimplify.c index f4bc649..b27776a 100644 --- a/gcc/gimplify.c +++ b/gcc/gimplify.c @@ -1825,6 +1825,8 @@ static bool is_var_need_auto_init (tree decl) { if (auto_var_p (decl) + && (TREE_CODE (decl) != VAR_DECL + || !DECL_HARD_REGISTER (decl)) && (flag_auto_var_init > AUTO_INIT_UNINITIALIZED) && (!lookup_attribute ("uninitialized", DECL_ATTRIBUTES (decl))) && !is_empty_type (TREE_TYPE (decl))) diff --git a/gcc/testsuite/gcc.dg/auto-init-hardreg-1.c b/gcc/testsuite/gcc.dg/auto-init-hardreg-1.c new file mode 100644 index 0000000..7c9de99 --- /dev/null +++ b/gcc/testsuite/gcc.dg/auto-init-hardreg-1.c @@ -0,0 +1,9 @@ +/* { dg-do run { target i?86-*-* x86_64-*-* } } */ +/* { dg-options "-ftrivial-auto-var-init=zero" } */ + +int +main () +{ + register long *sp __asm__("sp"); + return 0; +} |