From a582b0a53d1dc8604a201348b99ca8de48784e7e Mon Sep 17 00:00:00 2001 From: jiwang 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 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 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