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| author | Bernd Schmidt <bernds@redhat.com> | 2016-03-18 19:09:08 +0000 |
|---|---|---|
| committer | Bernd Schmidt <bernds@gcc.gnu.org> | 2016-03-18 19:09:08 +0000 |
| commit | 5c6a601cd2eac3730d4e00a0c1fe0b3cdb5fc1b4 (patch) | |
| tree | 56844518935399d010918f8fc3def7ad42f8012f /gcc/lra-constraints.c | |
| parent | 4bbf545b8b47ef2a1a2a8a666f88dfe7ba9fe23a (diff) | |
| download | gcc-5c6a601cd2eac3730d4e00a0c1fe0b3cdb5fc1b4.zip gcc-5c6a601cd2eac3730d4e00a0c1fe0b3cdb5fc1b4.tar.gz gcc-5c6a601cd2eac3730d4e00a0c1fe0b3cdb5fc1b4.tar.bz2 | |
Fix PR70278, a problem with the previous split_reg change
PR rtl-optimization/70278
* lra-constraints.c (split_reg): Handle the case where biggest_mode is
VOIDmode.
testsuite/
* gcc.dg/torture/pr70278.c: New test.
* gcc.target/arm/pr70278.c: New test.
From-SVN: r234342
Diffstat (limited to 'gcc/lra-constraints.c')
| -rw-r--r-- | gcc/lra-constraints.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c index ced9e12..4883eef 100644 --- a/gcc/lra-constraints.c +++ b/gcc/lra-constraints.c @@ -4982,7 +4982,12 @@ split_reg (bool before_p, int original_regno, rtx_insn *insn, nregs = 1; mode = lra_reg_info[hard_regno].biggest_mode; machine_mode reg_rtx_mode = GET_MODE (regno_reg_rtx[hard_regno]); - if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (reg_rtx_mode)) + /* A reg can have a biggest_mode of VOIDmode if it was only ever seen + as part of a multi-word register. In that case, or if the biggest + mode was larger than a register, just use the reg_rtx. Otherwise, + limit the size to that of the biggest access in the function. */ + if (mode == VOIDmode + || GET_MODE_SIZE (mode) > GET_MODE_SIZE (reg_rtx_mode)) { original_reg = regno_reg_rtx[hard_regno]; mode = reg_rtx_mode; |