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| author | Uros Bizjak <uros@gcc.gnu.org> | 2011-08-20 12:15:59 +0200 |
|---|---|---|
| committer | Uros Bizjak <uros@gcc.gnu.org> | 2011-08-20 12:15:59 +0200 |
| commit | 198cb1664a59ee3b71661952b471015af5edec2d (patch) | |
| tree | 5e1bea9cbb1b316ebdd6ad33c12ba47f37420891 /gcc/config | |
| parent | f47a61f332d35e1398e0864694b4156b5e502f82 (diff) | |
| download | gcc-198cb1664a59ee3b71661952b471015af5edec2d.zip gcc-198cb1664a59ee3b71661952b471015af5edec2d.tar.gz gcc-198cb1664a59ee3b71661952b471015af5edec2d.tar.bz2 | |
i386.c (ix86_expand_round_sse4): Expand as trunc (a + copysign (nextafter (0.5, 0.0), a)).
* config/i386/i386.c (ix86_expand_round_sse4): Expand as
trunc (a + copysign (nextafter (0.5, 0.0), a)).
From-SVN: r177927
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 53c5944..bdcbd26 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -32700,42 +32700,44 @@ void ix86_expand_round_sse4 (rtx op0, rtx op1) { enum machine_mode mode = GET_MODE (op0); - rtx e1, e2, e3, res, half, mask; + rtx e1, e2, res, half; const struct real_format *fmt; REAL_VALUE_TYPE pred_half, half_minus_pred_half; + rtx (*gen_copysign) (rtx, rtx, rtx); rtx (*gen_round) (rtx, rtx, rtx); switch (mode) { case SFmode: + gen_copysign = gen_copysignsf3; gen_round = gen_sse4_1_roundsf2; break; case DFmode: + gen_copysign = gen_copysigndf3; gen_round = gen_sse4_1_rounddf2; break; default: gcc_unreachable (); } - /* e1 = fabs(op1) */ - e1 = ix86_expand_sse_fabs (op1, &mask); + /* round (a) = trunc (a + copysign (0.5, a)) */ /* load nextafter (0.5, 0.0) */ fmt = REAL_MODE_FORMAT (mode); real_2expN (&half_minus_pred_half, -(fmt->p) - 1, mode); REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf, half_minus_pred_half); + half = const_double_from_real_value (pred_half, mode); - /* e2 = e1 + 0.5 */ - half = force_reg (mode, const_double_from_real_value (pred_half, mode)); - e2 = expand_simple_binop (mode, PLUS, e1, half, NULL_RTX, 0, OPTAB_DIRECT); + /* e1 = copysign (0.5, op1) */ + e1 = gen_reg_rtx (mode); + emit_insn (gen_copysign (e1, half, op1)); - /* e3 = trunc(e2) */ - e3 = gen_reg_rtx (mode); - emit_insn (gen_round (e3, e2, GEN_INT (ROUND_TRUNC))); + /* e2 = op1 + e1 */ + e2 = expand_simple_binop (mode, PLUS, op1, e1, NULL_RTX, 0, OPTAB_DIRECT); - /* res = copysign (e3, op1) */ + /* res = trunc (e2) */ res = gen_reg_rtx (mode); - ix86_sse_copysign_to_positive (res, e3, op1, mask); + emit_insn (gen_round (res, e2, GEN_INT (ROUND_TRUNC))); emit_move_insn (op0, res); } |