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| author | Richard Kenner <kenner@gcc.gnu.org> | 1992-12-26 18:11:20 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1992-12-26 18:11:20 -0500 |
| commit | eae957a8b8701537efa1af34a619971e5f81827e (patch) | |
| tree | f31daf97cc7a7e3981def1d3b2f67d4fd910f5bc /gcc/combine.c | |
| parent | bc957254f84a395d45e2fe9734defd0812bedd6a (diff) | |
| download | gcc-eae957a8b8701537efa1af34a619971e5f81827e.zip gcc-eae957a8b8701537efa1af34a619971e5f81827e.tar.gz gcc-eae957a8b8701537efa1af34a619971e5f81827e.tar.bz2 | |
(gen_lowpart_for_combine): Allow MODE to be wider than a word in
restricted circumstances.
From-SVN: r2914
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 331e6ce..360c81e 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -7416,7 +7416,14 @@ gen_lowpart_for_combine (mode, x) if (GET_MODE (x) == mode) return x; - if (GET_MODE_SIZE (mode) > UNITS_PER_WORD) + /* We can only support MODE being wider than a word if X is a + constant integer or has a mode the same size. */ + + if (GET_MODE_SIZE (mode) > UNITS_PER_WORD + && ! ((GET_MODE (x) == VOIDmode + && (GET_CODE (x) == CONST_INT + || GET_CODE (x) == CONST_DOUBLE)) + || GET_MODE_SIZE (GET_MODE (x)) == GET_MODE_SIZE (mode))) return gen_rtx (CLOBBER, GET_MODE (x), const0_rtx); /* X might be a paradoxical (subreg (mem)). In that case, gen_lowpart |