diff options
| author | aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-05-09 17:16:54 +0000 |
|---|---|---|
| committer | aoliva <aoliva@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-05-09 17:16:54 +0000 |
| commit | 291ee89df99af129659f365849e613a27928e033 (patch) | |
| tree | a45f9fe5c6841a2561bee0d8369feff64fbea99c /gcc/reload1.c | |
| parent | ee7cbe0eb1a1f34f7cf6913e9455adb67cb9d261 (diff) | |
| download | gcc-291ee89df99af129659f365849e613a27928e033.tar.gz | |
* reload1.c (reload_cse_move2add): Don't turn an implicit
truncation into a self-set in the narrow mode.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@66638 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/reload1.c')
| -rw-r--r-- | gcc/reload1.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 792dd467e89..adae5c8a162 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -9166,7 +9166,14 @@ reload_cse_move2add (first) value flag. jump2 already knows how to get rid of no-op moves. */ if (new_src == const0_rtx) - validate_change (insn, &SET_SRC (pat), reg, 0); + { + /* If the constants are different, this is a + truncation, that, if turned into (set (reg) + (reg)), would be discarded. Maybe we should + try a truncMN pattern? */ + if (INTVAL (src) == reg_offset [regno]) + validate_change (insn, &SET_SRC (pat), reg, 0); + } else if (rtx_cost (new_src, PLUS) < rtx_cost (src, SET) && have_add2_insn (reg, new_src)) { @@ -9252,9 +9259,15 @@ reload_cse_move2add (first) int success = 0; if (new_src == const0_rtx) - /* See above why we create (set (reg) (reg)) here. */ - success - = validate_change (next, &SET_SRC (set), reg, 0); + { + if (INTVAL (src) == reg_offset [regno]) + /* See above why we create (set (reg) + (reg)) here. */ + success + = validate_change (next, &SET_SRC (set), reg, 0); + else + success = 0; + } else if ((rtx_cost (new_src, PLUS) < COSTS_N_INSNS (1) + rtx_cost (src3, SET)) && have_add2_insn (reg, new_src)) |