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| author | Matthew Fortune <matthew.fortune@imgtec.com> | 2017-10-31 18:27:52 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2017-10-31 18:27:52 +0000 |
| commit | 8e02e8a0a588d0dbd64c375dd604fecc8fde2f83 (patch) | |
| tree | a1da5ce33f1ff799ca3bb72be6046baa4671c8fa /gcc/lra-constraints.c | |
| parent | e6b6e96a4fbe61536d3992529639fd7dcb2279e2 (diff) | |
| download | gcc-8e02e8a0a588d0dbd64c375dd604fecc8fde2f83.zip gcc-8e02e8a0a588d0dbd64c375dd604fecc8fde2f83.tar.gz gcc-8e02e8a0a588d0dbd64c375dd604fecc8fde2f83.tar.bz2 | |
re PR rtl-optimization/81803 (miscompilation at -O1 on mips64el)
PR rtl-optimization/81803
* lra-constraints.c (curr_insn_transform): Also reload the whole
register for a strict subreg no wider than a word if this is for
a WORD_REGISTER_OPERATIONS target.
Co-Authored-By: Eric Botcazou <ebotcazou@adacore.com>
From-SVN: r254275
Diffstat (limited to 'gcc/lra-constraints.c')
| -rw-r--r-- | gcc/lra-constraints.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c index a423f06..3758409 100644 --- a/gcc/lra-constraints.c +++ b/gcc/lra-constraints.c @@ -4207,8 +4207,9 @@ curr_insn_transform (bool check_only_p) reg = SUBREG_REG (*loc); byte = SUBREG_BYTE (*loc); if (REG_P (reg) - /* Strict_low_part requires reload the register not - the sub-register. */ + /* Strict_low_part requires reloading the register and not + just the subreg. Likewise for a strict subreg no wider + than a word for WORD_REGISTER_OPERATIONS targets. */ && (curr_static_id->operand[i].strict_low || (!paradoxical_subreg_p (mode, GET_MODE (reg)) && (hard_regno @@ -4219,7 +4220,11 @@ curr_insn_transform (bool check_only_p) && (goal_alt[i] == NO_REGS || (simplify_subreg_regno (ira_class_hard_regs[goal_alt[i]][0], - GET_MODE (reg), byte, mode) >= 0))))) + GET_MODE (reg), byte, mode) >= 0))) + || (GET_MODE_PRECISION (mode) + < GET_MODE_PRECISION (GET_MODE (reg)) + && GET_MODE_SIZE (GET_MODE (reg)) <= UNITS_PER_WORD + && WORD_REGISTER_OPERATIONS))) { /* An OP_INOUT is required when reloading a subreg of a mode wider than a word to ensure that data beyond the |