diff options
| author | zack <zack@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-07-17 18:31:50 +0000 |
|---|---|---|
| committer | zack <zack@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-07-17 18:31:50 +0000 |
| commit | e2496245b8453f49bb4428f281af7686be09ddf8 (patch) | |
| tree | 686ae8c464a8aa900c031d14c4d56fe381b24133 /gcc/simplify-rtx.c | |
| parent | 9de4d8106cde6d7e760fa981a548a8e9aefec2e7 (diff) | |
| download | gcc-e2496245b8453f49bb4428f281af7686be09ddf8.tar.gz | |
* simplify-rtx.c (simplify_binary_operation): Recognize
(compare (gt[u] (cc) 0) (lt[u] (cc) 0)).
(simplify_ternary_operation): Do not examine MODE_BITSIZE of
a CONST_INT, it will always be zero.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35098 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 7426949456d..67f7babfc1f 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -948,11 +948,29 @@ simplify_binary_operation (code, mode, op0, op1) || ! FLOAT_MODE_P (mode) || flag_fast_math) && op1 == CONST0_RTX (mode)) return op0; +#endif + + /* Convert (compare (gt (flags) 0) (lt (flags) 0)) to (flags). */ + if (((GET_CODE (op0) == GT && GET_CODE (op1) == LT) + || (GET_CODE (op0) == GTU && GET_CODE (op1) == LTU)) + && XEXP (op0, 1) == const0_rtx && XEXP (op1, 1) == const0_rtx) + { + rtx xop00 = XEXP (op0, 0); + rtx xop10 = XEXP (op1, 0); + +#ifdef HAVE_cc0 + if (GET_CODE (xop00) == CC0 && GET_CODE (xop10) == CC0) #else - /* Do nothing here. */ + if (GET_CODE (xop00) == REG && GET_CODE (xop10) == REG + && GET_MODE (xop00) == GET_MODE (xop10) + && REGNO (xop00) == REGNO (xop10) + && GET_MODE_CLASS (GET_MODE (xop00)) == MODE_CC + && GET_MODE_CLASS (GET_MODE (xop10)) == MODE_CC) #endif - break; - + return xop00; + } + + break; case MINUS: /* None of these optimizations can be done for IEEE floating point. */ @@ -1912,8 +1930,7 @@ simplify_ternary_operation (code, mode, op0_mode, op0, op1, op2) if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT && GET_CODE (op2) == CONST_INT - && ((unsigned) INTVAL (op1) + (unsigned) INTVAL (op2) - <= GET_MODE_BITSIZE (op0_mode)) + && ((unsigned) INTVAL (op1) + (unsigned) INTVAL (op2) <= width) && width <= (unsigned) HOST_BITS_PER_WIDE_INT) { /* Extracting a bit-field from a constant */ |