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| author | John Wehle <john@feith.com> | 2000-09-16 23:38:20 +0000 |
|---|---|---|
| committer | John Wehle <wehle@gcc.gnu.org> | 2000-09-16 23:38:20 +0000 |
| commit | ae0fb1b9fb8a105b01a4bc6a3bdb58cbac5ee741 (patch) | |
| tree | bc849c501c82961a4386b8600a081e9731f95c64 /gcc | |
| parent | f93dacbdefbd440732896d176447c814d61458bf (diff) | |
| download | gcc-ae0fb1b9fb8a105b01a4bc6a3bdb58cbac5ee741.zip gcc-ae0fb1b9fb8a105b01a4bc6a3bdb58cbac5ee741.tar.gz gcc-ae0fb1b9fb8a105b01a4bc6a3bdb58cbac5ee741.tar.bz2 | |
rtlanal.c (rtx_varies_p): Volatile asms vary.
* rtlanal.c (rtx_varies_p): Volatile asms vary.
(rtx_unstable_p): Restructure code. Volatile asms
are unstable.
From-SVN: r36462
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/rtlanal.c | 44 |
2 files changed, 39 insertions, 11 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ccce0a7..1a0ccb9 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +Sat Sep 16 19:42:50 EDT 2000 John Wehle (john@feith.com) + + * rtlanal.c (rtx_varies_p): Volatile asms vary. + (rtx_unstable_p): Restructure code. Volatile asms + are unstable. + Sat Sep 16 14:35:55 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu> * stor-layout.c (place_field): Don't do anything if field or diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 8424b8e..c19b3f5 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -52,20 +52,36 @@ rtx_unstable_p (x) register int i; register const char *fmt; - if (code == MEM) - return ! RTX_UNCHANGING_P (x) || rtx_unstable_p (XEXP (x, 0)); + switch (code) + { + case MEM: + return ! RTX_UNCHANGING_P (x) || rtx_unstable_p (XEXP (x, 0)); - if (code == QUEUED) - return 1; + case QUEUED: + return 1; - if (CONSTANT_P (x)) - return 0; + case CONST: + case CONST_INT: + case CONST_DOUBLE: + case SYMBOL_REF: + case LABEL_REF: + return 0; - if (code == REG) - /* As in rtx_varies_p, we have to use the actual rtx, not reg number. */ - return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx - || x == arg_pointer_rtx || x == pic_offset_table_rtx - || RTX_UNCHANGING_P (x)); + case REG: + /* As in rtx_varies_p, we have to use the actual rtx, not reg number. */ + return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx + || x == arg_pointer_rtx || x == pic_offset_table_rtx + || RTX_UNCHANGING_P (x)); + + case ASM_OPERANDS: + if (MEM_VOLATILE_P (x)) + return 1; + + /* FALLTHROUGH */ + + default: + break; + } fmt = GET_RTX_FORMAT (code); for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) @@ -126,6 +142,12 @@ rtx_varies_p (x) (in fact is it related specifically to operand 1). */ return rtx_varies_p (XEXP (x, 1)); + case ASM_OPERANDS: + if (MEM_VOLATILE_P (x)) + return 1; + + /* FALLTHROUGH */ + default: break; } |