diff options
Diffstat (limited to 'gcc/rtlanal.c')
| -rw-r--r-- | gcc/rtlanal.c | 44 |
1 files changed, 33 insertions, 11 deletions
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 8424b8e2cde..c19b3f5fa97 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; } |
