Brad Bishop | d7bf8c1 | 2018-02-25 22:55:05 -0500 | [diff] [blame] | 1 | From a582b0a53d1dc8604a201348b99ca8de48784e7e Mon Sep 17 00:00:00 2001 |
| 2 | From: jiwang <jiwang@138bc75d-0d04-0410-961f-82ee72b054a4> |
| 3 | Date: Thu, 12 May 2016 17:00:52 +0000 |
| 4 | Subject: [PATCH] [LRA] PR70904, relax the restriction on subreg reload for |
| 5 | wide mode |
| 6 | |
| 7 | 2016-05-12 Jiong Wang <jiong.wang@arm.com> |
| 8 | |
| 9 | gcc/ |
| 10 | PR rtl-optimization/70904 |
| 11 | * lra-constraint.c (process_addr_reg): Relax the restriction on |
| 12 | subreg reload for wide mode. |
| 13 | |
| 14 | git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@236181 138bc75d-0d04-0410-961f-82ee72b054a4 |
| 15 | --- |
| 16 | Upstream-Status: Backport |
| 17 | Signed-off-by: Khem Raj <raj.khem@gmail.com> |
| 18 | |
| 19 | gcc/lra-constraints.c | 16 +++++++++++++++- |
| 20 | 1 file changed, 15 insertions(+), 1 deletion(-) |
| 21 | |
| 22 | diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c |
| 23 | index f96fd458e23..73fb72a2ea5 100644 |
| 24 | --- a/gcc/lra-constraints.c |
| 25 | +++ b/gcc/lra-constraints.c |
| 26 | @@ -1326,7 +1326,21 @@ process_addr_reg (rtx *loc, bool check_only_p, rtx_insn **before, rtx_insn **aft |
| 27 | |
| 28 | subreg_p = GET_CODE (*loc) == SUBREG; |
| 29 | if (subreg_p) |
| 30 | - loc = &SUBREG_REG (*loc); |
| 31 | + { |
| 32 | + reg = SUBREG_REG (*loc); |
| 33 | + mode = GET_MODE (reg); |
| 34 | + |
| 35 | + /* For mode with size bigger than ptr_mode, there unlikely to be "mov" |
| 36 | + between two registers with different classes, but there normally will |
| 37 | + be "mov" which transfers element of vector register into the general |
| 38 | + register, and this normally will be a subreg which should be reloaded |
| 39 | + as a whole. This is particularly likely to be triggered when |
| 40 | + -fno-split-wide-types specified. */ |
| 41 | + if (in_class_p (reg, cl, &new_class) |
| 42 | + || GET_MODE_SIZE (mode) <= GET_MODE_SIZE (ptr_mode)) |
| 43 | + loc = &SUBREG_REG (*loc); |
| 44 | + } |
| 45 | + |
| 46 | reg = *loc; |
| 47 | mode = GET_MODE (reg); |
| 48 | if (! REG_P (reg)) |
| 49 | -- |
| 50 | 2.14.2 |
| 51 | |