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| author | Richard Kenner <kenner@gcc.gnu.org> | 1994-07-08 18:30:49 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1994-07-08 18:30:49 -0400 |
| commit | 1c75dfa4420861aab38c2ebc5fa469bea22dae04 (patch) | |
| tree | d4fc35b87f3efc9b59e116cb97bf0fda499f5b04 | |
| parent | a890174971baeb7df28d7c86251fecd234094fac (diff) | |
| download | gcc-1c75dfa4420861aab38c2ebc5fa469bea22dae04.zip gcc-1c75dfa4420861aab38c2ebc5fa469bea22dae04.tar.gz gcc-1c75dfa4420861aab38c2ebc5fa469bea22dae04.tar.bz2 | |
(force_to_mode): OP_MODE must be MODE if MODE and mode of X are of different classes.
(force_to_mode): OP_MODE must be MODE if MODE and mode of X are of different
classes.
(nonzero_bits, num_sign_bit_copies): Say nothing known for floating-point
modes.
From-SVN: r7688
| -rw-r--r-- | gcc/combine.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 81f55e9..d5b093f 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5608,7 +5608,8 @@ force_to_mode (x, mode, mask, reg, just_select) /* We want to perform the operation is its present mode unless we know that the operation is valid in MODE, in which case we do the operation in MODE. */ - op_mode = ((code_to_optab[(int) code] != 0 + op_mode = ((GET_MODE_CLASS (mode) == GET_MODE_CLASS (GET_MODE (x)) + && code_to_optab[(int) code] != 0 && (code_to_optab[(int) code]->handlers[(int) mode].insn_code != CODE_FOR_nothing)) ? mode : GET_MODE (x)); @@ -6667,6 +6668,10 @@ nonzero_bits (x, mode) int mode_width = GET_MODE_BITSIZE (mode); rtx tem; + /* For floating-point values, assume all bits are needed. */ + if (FLOAT_MODE_P (GET_MODE (x)) || FLOAT_MODE_P (mode)) + return nonzero; + /* If X is wider than MODE, use its mode instead. */ if (GET_MODE_BITSIZE (GET_MODE (x)) > mode_width) { @@ -7026,12 +7031,13 @@ num_sign_bit_copies (x, mode) rtx tem; /* If we weren't given a mode, use the mode of X. If the mode is still - VOIDmode, we don't know anything. */ + VOIDmode, we don't know anything. Likewise if one of the modes is + floating-point. */ if (mode == VOIDmode) mode = GET_MODE (x); - if (mode == VOIDmode) + if (mode == VOIDmode || FLOAT_MODE_P (mode) || FLOAT_MODE_P (GET_MODE (x))) return 1; bitwidth = GET_MODE_BITSIZE (mode); |