diff options
| author | Richard Henderson <rth@redhat.com> | 2004-12-02 10:31:26 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2004-12-02 10:31:26 -0800 |
| commit | 6b1326732bdf889ce830b6c2d238acea28ec4930 (patch) | |
| tree | 4f3f14e10e3132e1dd06c628f3a496fb44bcf651 | |
| parent | dea1c1c5366ffb20410328c725af453484fd8dcb (diff) | |
| download | gcc-6b1326732bdf889ce830b6c2d238acea28ec4930.zip gcc-6b1326732bdf889ce830b6c2d238acea28ec4930.tar.gz gcc-6b1326732bdf889ce830b6c2d238acea28ec4930.tar.bz2 | |
optabs.c (lowpart_subreg_maybe_copy): New.
* optabs.c (lowpart_subreg_maybe_copy): New.
(expand_unop, expand_abs_nojump): Use it.
From-SVN: r91650
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/optabs.c | 26 |
2 files changed, 29 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b91e928..96ef779 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2004-12-02 Richard Henderson <rth@redhat.com> + + * optabs.c (lowpart_subreg_maybe_copy): New. + (expand_unop, expand_abs_nojump): Use it. + 2004-12-02 J"orn Rennecke <joern.rennecke@st.com> * sh.md (extv, extzv): Add pattern predicate. diff --git a/gcc/optabs.c b/gcc/optabs.c index 14f2b72..abf8e29 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -2131,6 +2131,26 @@ expand_parity (enum machine_mode mode, rtx op0, rtx target) return 0; } +/* Extract the OMODE lowpart from VAL, which has IMODE. Under certain + conditions, VAL may already be a SUBREG against which we cannot generate + a further SUBREG. In this case, we expect forcing the value into a + register will work around the situation. */ + +static rtx +lowpart_subreg_maybe_copy (enum machine_mode omode, rtx val, + enum machine_mode imode) +{ + rtx ret; + ret = lowpart_subreg (omode, val, imode); + if (ret == NULL) + { + val = force_reg (imode, val); + ret = lowpart_subreg (omode, val, imode); + gcc_assert (ret != NULL); + } + return ret; +} + /* Generate code to perform an operation specified by UNOPTAB on operand OP0, with result having machine-mode MODE. @@ -2322,7 +2342,8 @@ expand_unop (enum machine_mode mode, optab unoptab, rtx op0, rtx target, rtx insn; if (target == 0) target = gen_reg_rtx (mode); - insn = emit_move_insn (target, gen_lowpart (mode, temp)); + temp = lowpart_subreg_maybe_copy (mode, temp, imode); + insn = emit_move_insn (target, temp); set_unique_reg_note (insn, REG_EQUAL, gen_rtx_fmt_e (NEG, mode, copy_rtx (op0))); @@ -2513,7 +2534,8 @@ expand_abs_nojump (enum machine_mode mode, rtx op0, rtx target, rtx insn; if (target == 0) target = gen_reg_rtx (mode); - insn = emit_move_insn (target, gen_lowpart (mode, temp)); + temp = lowpart_subreg_maybe_copy (mode, temp, imode); + insn = emit_move_insn (target, temp); set_unique_reg_note (insn, REG_EQUAL, gen_rtx_fmt_e (ABS, mode, copy_rtx (op0))); |