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Diffstat (limited to 'gcc-4.9/gcc/lra-eliminations.c')
| -rw-r--r-- | gcc-4.9/gcc/lra-eliminations.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/lra-eliminations.c b/gcc-4.9/gcc/lra-eliminations.c index abdf69733..278782035 100644 --- a/gcc-4.9/gcc/lra-eliminations.c +++ b/gcc-4.9/gcc/lra-eliminations.c @@ -565,6 +565,16 @@ lra_eliminate_regs_1 (rtx insn, rtx x, enum machine_mode mem_mode, alter_subreg (&x, false); return x; } + else if (! subst_p) + { + /* LRA can transform subregs itself. So don't call + simplify_gen_subreg until LRA transformations are + finished. Function simplify_gen_subreg can do + non-trivial transformations (like truncation) which + might make LRA work to fail. */ + SUBREG_REG (x) = new_rtx; + return x; + } else return simplify_gen_subreg (GET_MODE (x), new_rtx, GET_MODE (new_rtx), SUBREG_BYTE (x)); |