diff options
| author | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-03-18 19:09:08 +0000 |
|---|---|---|
| committer | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-03-18 19:09:08 +0000 |
| commit | e7142ce1fb81c48623bef1c30ef3fe222c89b25f (patch) | |
| tree | 56844518935399d010918f8fc3def7ad42f8012f /gcc/lra-constraints.c | |
| parent | 5539bc70a31b6694a83c6b6a5dc528fae73378f9 (diff) | |
| download | gcc-e7142ce1fb81c48623bef1c30ef3fe222c89b25f.tar.gz | |
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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@234342 138bc75d-0d04-0410-961f-82ee72b054a4
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 ced9e12b0f1..4883eefc532 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; |