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| author | Zhenqiang Chen <zhenqiang.chen@arm.com> | 2014-11-03 03:20:30 +0000 |
|---|---|---|
| committer | Zhenqiang Chen <zqchen@gcc.gnu.org> | 2014-11-03 03:20:30 +0000 |
| commit | 81a55f55dabdb89bd9bedbd8b95c34a393b2e364 (patch) | |
| tree | 963276b41d6c1074dc9c30b6baeecfdd8d362756 /gcc/ifcvt.c | |
| parent | afc449e82cb99424361f95190cec4381e4da11f8 (diff) | |
| download | gcc-81a55f55dabdb89bd9bedbd8b95c34a393b2e364.zip gcc-81a55f55dabdb89bd9bedbd8b95c34a393b2e364.tar.gz gcc-81a55f55dabdb89bd9bedbd8b95c34a393b2e364.tar.bz2 | |
ifcvt.c (noce_emit_cmove, [...]): Allow CC mode if HAVE_cbranchcc4.
2014-11-03 Zhenqiang Chen <zhenqiang.chen@arm.com>
* ifcvt.c (noce_emit_cmove, noce_get_alt_condition, noce_get_condition):
Allow CC mode if HAVE_cbranchcc4.
From-SVN: r217026
Diffstat (limited to 'gcc/ifcvt.c')
| -rw-r--r-- | gcc/ifcvt.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index 772b184..f8ea467 100644 --- a/gcc/ifcvt.c +++ b/gcc/ifcvt.c @@ -1448,10 +1448,17 @@ noce_emit_cmove (struct noce_if_info *if_info, rtx x, enum rtx_code code, end_sequence (); } - /* Don't even try if the comparison operands are weird. */ + /* Don't even try if the comparison operands are weird + except that the target supports cbranchcc4. */ if (! general_operand (cmp_a, GET_MODE (cmp_a)) || ! general_operand (cmp_b, GET_MODE (cmp_b))) - return NULL_RTX; + { +#if HAVE_cbranchcc4 + if (GET_MODE_CLASS (GET_MODE (cmp_a)) != MODE_CC + || cmp_b != const0_rtx) +#endif + return NULL_RTX; + } #if HAVE_conditional_move unsignedp = (code == LTU || code == GEU @@ -1777,6 +1784,11 @@ noce_get_alt_condition (struct noce_if_info *if_info, rtx target, rtx cond, set; rtx_insn *insn; int reverse; + int allow_cc_mode = false; +#if HAVE_cbranchcc4 + allow_cc_mode = true; +#endif + /* If target is already mentioned in the known condition, return it. */ if (reg_mentioned_p (target, if_info->cond)) @@ -1898,7 +1910,7 @@ noce_get_alt_condition (struct noce_if_info *if_info, rtx target, } cond = canonicalize_condition (if_info->jump, cond, reverse, - earliest, target, false, true); + earliest, target, allow_cc_mode, true); if (! cond || ! reg_mentioned_p (target, cond)) return NULL; @@ -2354,6 +2366,10 @@ noce_get_condition (rtx_insn *jump, rtx_insn **earliest, bool then_else_reversed { rtx cond, set, tmp; bool reverse; + int allow_cc_mode = false; +#if HAVE_cbranchcc4 + allow_cc_mode = true; +#endif if (! any_condjump_p (jump)) return NULL_RTX; @@ -2390,7 +2406,7 @@ noce_get_condition (rtx_insn *jump, rtx_insn **earliest, bool then_else_reversed /* Otherwise, fall back on canonicalize_condition to do the dirty work of manipulating MODE_CC values and COMPARE rtx codes. */ tmp = canonicalize_condition (jump, cond, reverse, earliest, - NULL_RTX, false, true); + NULL_RTX, allow_cc_mode, true); /* We don't handle side-effects in the condition, like handling REG_INC notes and making sure no duplicate conditions are emitted. */ |