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author | nickc <nickc@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-10-28 10:30:46 +0000 |
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committer | nickc <nickc@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-10-28 10:30:46 +0000 |
commit | 851e684973e14b082bcc5297b0aa77cc7ce8868d (patch) | |
tree | de3b301456c7de16320fcb33ace83dc50e815d73 /gcc/expr.c | |
parent | 1e16645ca26a03b84454c61cf46e77d9b635fceb (diff) | |
download | ppe42-gcc-851e684973e14b082bcc5297b0aa77cc7ce8868d.tar.gz ppe42-gcc-851e684973e14b082bcc5297b0aa77cc7ce8868d.zip |
Add code written by rth to generate use shifts to perform an extension if no
suitable extend patterns can be found.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@23398 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/expr.c')
-rw-r--r-- | gcc/expr.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/gcc/expr.c b/gcc/expr.c index 37581ec39ce..1dd7cb718d6 100644 --- a/gcc/expr.c +++ b/gcc/expr.c @@ -1100,6 +1100,8 @@ convert_move (to, from, unsignedp) else { enum machine_mode intermediate; + rtx tmp; + tree shift_amount; /* Search for a mode to convert via. */ for (intermediate = from_mode; intermediate != VOIDmode; @@ -1116,8 +1118,18 @@ convert_move (to, from, unsignedp) return; } - /* No suitable intermediate mode. */ - abort (); + /* No suitable intermediate mode. + Generate what we need with shifts. */ + shift_amount = build_int_2 (GET_MODE_BITSIZE (to_mode) + - GET_MODE_BITSIZE (from_mode), 0); + from = gen_lowpart (to_mode, force_reg (from_mode, from)); + tmp = expand_shift (LSHIFT_EXPR, to_mode, from, shift_amount, + to, unsignedp); + tmp = expand_shift (RSHIFT_EXPR, to_mode, tmp, shift_amount, + to, unsignedp); + if (tmp != to) + emit_move_insn (to, tmp); + return; } } |