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| author | Hans-Peter Nilsson <hp@bitrange.com> | 2002-09-20 03:06:25 +0000 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@gcc.gnu.org> | 2002-09-20 03:06:25 +0000 |
| commit | 6ee3db619b283cd330c9f88d28107a1f90f237fb (patch) | |
| tree | efd31f86a99ed9e398c49c538f5d9db14f66ac53 | |
| parent | e7a35dcc29ba93c9cdcd93c0c3b08bcced20309e (diff) | |
| download | gcc-6ee3db619b283cd330c9f88d28107a1f90f237fb.zip gcc-6ee3db619b283cd330c9f88d28107a1f90f237fb.tar.gz gcc-6ee3db619b283cd330c9f88d28107a1f90f237fb.tar.bz2 | |
mmix.md ("negdf2"): Rewrite.
* config/mmix/mmix.md ("negdf2"): Rewrite.
("*expanded_negdf2"): New.
From-SVN: r57332
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/mmix/mmix.md | 17 |
2 files changed, 18 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 0b22646..2496779 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2002-09-20 Hans-Peter Nilsson <hp@bitrange.com> + + * config/mmix/mmix.md ("negdf2"): Rewrite. + ("*expanded_negdf2"): New. + 2002-09-19 Jim Wilson <wilson@redhat.com> * combine.c (simplify_set): When optimizing a subreg src with a diff --git a/gcc/config/mmix/mmix.md b/gcc/config/mmix/mmix.md index 0f36872..d234d8c 100644 --- a/gcc/config/mmix/mmix.md +++ b/gcc/config/mmix/mmix.md @@ -348,13 +348,22 @@ DIVU %1,%1,%2\;GET %0,:rR\;NEGU %2,0,%0\;CSNN %0,$255,%2") "" "NEGU %0,0,%1") -;; FIXME: GCC should be able to synthesize this by itself as "0.0 - x". (define_expand "negdf2" + [(parallel [(set (match_operand:DF 0 "register_operand" "=r") + (neg:DF (match_operand:DF 1 "register_operand" "r"))) + (use (match_dup 2))])] + "" +{ + /* Emit bit-flipping sequence to be IEEE-safe wrt. -+0. */ + operands[2] = force_reg (DImode, GEN_INT ((HOST_WIDE_INT) 1 << 63)); +}) + +(define_insn "*expanded_negdf2" [(set (match_operand:DF 0 "register_operand" "=r") - (minus:DF (match_dup 2) - (match_operand:DF 1 "register_operand" "r")))] + (neg:DF (match_operand:DF 1 "register_operand" "r"))) + (use (match_operand:DI 2 "register_operand" "r"))] "" - "operands[2] = force_reg (DFmode, CONST0_RTX (DFmode));") + "XOR %0,%1,%2") ;; FIXME: define_expand for absdi2? |