diff options
| author | nemet <nemet@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-02-14 07:10:35 +0000 |
|---|---|---|
| committer | nemet <nemet@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-02-14 07:10:35 +0000 |
| commit | c2e0ce216797712a6ce774670ff6753428d2f16a (patch) | |
| tree | bc2ef4c9ed0be960f611c4b02d11af7828b26e2e /gcc/simplify-rtx.c | |
| parent | c071a2dff4d3e938f05021e7568bfae44bde944c (diff) | |
| download | gcc-c2e0ce216797712a6ce774670ff6753428d2f16a.tar.gz | |
* simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: Return
new expression in the requested machine mode.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@110959 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 4cdbad754ed..c949dea1d16 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -609,12 +609,13 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op) return simplify_gen_unary (GET_CODE (op), mode, XEXP (XEXP (op, 0), 0), mode); - /* (truncate:SI (subreg:DI (truncate:SI X) 0)) is - (truncate:SI x). */ + /* (truncate:A (subreg:B (truncate:C X) 0)) is + (truncate:A X). */ if (GET_CODE (op) == SUBREG && GET_CODE (SUBREG_REG (op)) == TRUNCATE && subreg_lowpart_p (op)) - return SUBREG_REG (op); + return simplify_gen_unary (TRUNCATE, mode, XEXP (SUBREG_REG (op), 0), + GET_MODE (XEXP (SUBREG_REG (op), 0))); /* If we know that the value is already truncated, we can replace the TRUNCATE with a SUBREG if TRULY_NOOP_TRUNCATION |