| From a582b0a53d1dc8604a201348b99ca8de48784e7e Mon Sep 17 00:00:00 2001 |
| From: jiwang <jiwang@138bc75d-0d04-0410-961f-82ee72b054a4> |
| Date: Thu, 12 May 2016 17:00:52 +0000 |
| Subject: [PATCH] [LRA] PR70904, relax the restriction on subreg reload for |
| wide mode |
| |
| 2016-05-12 Jiong Wang <jiong.wang@arm.com> |
| |
| gcc/ |
| PR rtl-optimization/70904 |
| * lra-constraint.c (process_addr_reg): Relax the restriction on |
| subreg reload for wide mode. |
| |
| git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@236181 138bc75d-0d04-0410-961f-82ee72b054a4 |
| --- |
| Upstream-Status: Backport |
| Signed-off-by: Khem Raj <raj.khem@gmail.com> |
| |
| gcc/lra-constraints.c | 16 +++++++++++++++- |
| 1 file changed, 15 insertions(+), 1 deletion(-) |
| |
| diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c |
| index f96fd458e23..73fb72a2ea5 100644 |
| --- a/gcc/lra-constraints.c |
| +++ b/gcc/lra-constraints.c |
| @@ -1326,7 +1326,21 @@ process_addr_reg (rtx *loc, bool check_only_p, rtx_insn **before, rtx_insn **aft |
| |
| subreg_p = GET_CODE (*loc) == SUBREG; |
| if (subreg_p) |
| - loc = &SUBREG_REG (*loc); |
| + { |
| + reg = SUBREG_REG (*loc); |
| + mode = GET_MODE (reg); |
| + |
| + /* For mode with size bigger than ptr_mode, there unlikely to be "mov" |
| + between two registers with different classes, but there normally will |
| + be "mov" which transfers element of vector register into the general |
| + register, and this normally will be a subreg which should be reloaded |
| + as a whole. This is particularly likely to be triggered when |
| + -fno-split-wide-types specified. */ |
| + if (in_class_p (reg, cl, &new_class) |
| + || GET_MODE_SIZE (mode) <= GET_MODE_SIZE (ptr_mode)) |
| + loc = &SUBREG_REG (*loc); |
| + } |
| + |
| reg = *loc; |
| mode = GET_MODE (reg); |
| if (! REG_P (reg)) |
| -- |
| 2.14.2 |
| |