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| author | Richard Kenner <kenner@gcc.gnu.org> | 1995-03-18 16:59:10 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1995-03-18 16:59:10 -0500 |
| commit | 7a5b18b055a2e2bcf43fa8f75612ca1a21af9e1d (patch) | |
| tree | 4573fd714cc603e199f8c3fb31866dae28793200 /gcc | |
| parent | 94bafba74145e6735ecad4e0ee5651c70aea0201 (diff) | |
| download | gcc-7a5b18b055a2e2bcf43fa8f75612ca1a21af9e1d.zip gcc-7a5b18b055a2e2bcf43fa8f75612ca1a21af9e1d.tar.gz gcc-7a5b18b055a2e2bcf43fa8f75612ca1a21af9e1d.tar.bz2 | |
(gen_reload): Handle paradoxical SUBREGs.
From-SVN: r9208
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/reload1.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 7b9aa97..f8260c5 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -1,5 +1,5 @@ /* Reload pseudo regs into hard regs for insns that require hard regs. - Copyright (C) 1987, 88, 89, 92, 93, 1994 Free Software Foundation, Inc. + Copyright (C) 1987, 88, 89, 92, 93, 94, 1995 Free Software Foundation, Inc. This file is part of GNU CC. @@ -6649,6 +6649,20 @@ gen_reload (out, in, opnum, type) enum reload_type type; { rtx last = get_last_insn (); + rtx tem; + + /* If IN is a paradoxical SUBREG, remove it and try to put the + opposite SUBREG on OUT. Likewise for a paradoxical SUBREG on OUT. */ + if (GET_CODE (in) == SUBREG + && (GET_MODE_SIZE (GET_MODE (in)) + > GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))) + && (tem = gen_lowpart_common (GET_MODE (SUBREG_REG (in)), out)) != 0) + in = SUBREG_REG (in), out = tem; + else if (GET_CODE (out) == SUBREG + && (GET_MODE_SIZE (GET_MODE (out)) + > GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))) + && (tem = gen_lowpart_common (GET_MODE (SUBREG_REG (out)), in)) != 0) + out = SUBREG_REG (out), in = tem; /* How to do this reload can get quite tricky. Normally, we are being asked to reload a simple operand, such as a MEM, a constant, or a pseudo |