diff options
| author | Richard Kenner <kenner@gcc.gnu.org> | 1993-12-24 06:53:52 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1993-12-24 06:53:52 -0500 |
| commit | fe873240671995cde2757988dd17b3431d908ede (patch) | |
| tree | 3a0dbc6439bce4113d437b687670b62d2c06642d /gcc | |
| parent | 27f006ebb12cb8dfc50bb0dae2f9f256436475b6 (diff) | |
| download | gcc-fe873240671995cde2757988dd17b3431d908ede.zip gcc-fe873240671995cde2757988dd17b3431d908ede.tar.gz gcc-fe873240671995cde2757988dd17b3431d908ede.tar.bz2 | |
(simplify_binary_operation): Can fold multi-word operations when first is CONST_INT.
(simplify_binary_operation): Can fold multi-word operations when first is
CONST_INT.
(simplify_binary_operation, case PLUS, MINUS): Don't call plus_constant when
OP0 is VOIDmode.
From-SVN: r6298
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cse.c | 19 |
1 files changed, 13 insertions, 6 deletions
@@ -3321,12 +3321,15 @@ simplify_binary_operation (code, mode, op0, op1) /* We can fold some multi-word operations. */ if (GET_MODE_CLASS (mode) == MODE_INT - && GET_CODE (op0) == CONST_DOUBLE + && (GET_CODE (op0) == CONST_DOUBLE || GET_CODE (op0) == CONST_INT) && (GET_CODE (op1) == CONST_DOUBLE || GET_CODE (op1) == CONST_INT)) { HOST_WIDE_INT l1, l2, h1, h2, lv, hv; - l1 = CONST_DOUBLE_LOW (op0), h1 = CONST_DOUBLE_HIGH (op0); + if (GET_CODE (op0) == CONST_DOUBLE) + l1 = CONST_DOUBLE_LOW (op0), h1 = CONST_DOUBLE_HIGH (op0); + else + l1 = INTVAL (op0), h1 = l1 < 0 ? -1 : 0; if (GET_CODE (op1) == CONST_DOUBLE) l2 = CONST_DOUBLE_LOW (op1), h2 = CONST_DOUBLE_HIGH (op1); @@ -3463,11 +3466,15 @@ simplify_binary_operation (code, mode, op0, op1) /* Handle both-operands-constant cases. We can only add CONST_INTs to constants since the sum of relocatable symbols - can't be handled by most assemblers. */ + can't be handled by most assemblers. Don't add CONST_INT + to CONST_INT since overflow won't be computed properly if wider + than HOST_BITS_PER_WIDE_INT. */ - if (CONSTANT_P (op0) && GET_CODE (op1) == CONST_INT) + if (CONSTANT_P (op0) && GET_MODE (op0) != VOIDmode + && GET_CODE (op1) == CONST_INT) return plus_constant (op0, INTVAL (op1)); - else if (CONSTANT_P (op1) && GET_CODE (op0) == CONST_INT) + else if (CONSTANT_P (op1) && GET_MODE (op1) != VOIDmode + && GET_CODE (op0) == CONST_INT) return plus_constant (op1, INTVAL (op0)); /* If one of the operands is a PLUS or a MINUS, see if we can @@ -3542,7 +3549,7 @@ simplify_binary_operation (code, mode, op0, op1) return tem; /* Don't let a relocatable value get a negative coeff. */ - if (GET_CODE (op1) == CONST_INT) + if (GET_CODE (op1) == CONST_INT && GET_MODE (op1) != VOIDmode) return plus_constant (op0, - INTVAL (op1)); break; |