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| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-06-28 00:14:23 +0000 |
|---|---|---|
| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-06-28 00:14:23 +0000 |
| commit | 196e03f1cff897d136a28826968dcce5acc9ac86 (patch) | |
| tree | 55584ceccdd01345c451779238b56ecb878546f7 /gcc/simplify-rtx.c | |
| parent | 3c52ba3b2ad0880baad1e8a038018dcb8346772b (diff) | |
| download | gcc-196e03f1cff897d136a28826968dcce5acc9ac86.tar.gz | |
* simplify-rtx.c (simplify_rtx): Canonicalize commutative expressions
by putting complex operands first and constants second.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@43621 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index b2123c16654..a5ef0993600 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -2520,8 +2520,26 @@ simplify_rtx (x) case '1': return simplify_unary_operation (code, mode, XEXP (x, 0), GET_MODE (XEXP (x, 0))); - case '2': case 'c': + /* Put complex operands first and constants second if commutative. */ + if (GET_RTX_CLASS (code) == 'c' + && ((CONSTANT_P (XEXP (x, 0)) && GET_CODE (XEXP (x, 1)) != CONST_INT) + || (GET_RTX_CLASS (GET_CODE (XEXP (x, 0))) == 'o' + && GET_RTX_CLASS (GET_CODE (XEXP (x, 1))) != 'o') + || (GET_CODE (XEXP (x, 0)) == SUBREG + && GET_RTX_CLASS (GET_CODE (SUBREG_REG (XEXP (x, 0)))) == 'o' + && GET_RTX_CLASS (GET_CODE (XEXP (x, 1))) != 'o'))) + { + rtx tem; + + tem = XEXP (x, 0); + XEXP (x, 0) = XEXP (x, 1); + XEXP (x, 1) = tem; + return simplify_binary_operation (code, mode, + XEXP (x, 0), XEXP (x, 1)); + } + + case '2': return simplify_binary_operation (code, mode, XEXP (x, 0), XEXP (x, 1)); case '3': |