@@ -7486,6 +7486,8 @@ arm_legitimate_index_p (machine_mode mode, rtx index, RTX_CODE outer,
{
HOST_WIDE_INT val = INTVAL (index);
+ /* Assume we emit ldrd or 2x ldr if !TARGET_LDRD.
+ If vldr is selected it uses arm_coproc_mem_operand. */
if (TARGET_LDRD)
return val > -256 && val < 256;
else
@@ -7613,11 +7615,13 @@ thumb2_legitimate_index_p (machine_mode mode, rtx index, int strict_p)
if (code == CONST_INT)
{
HOST_WIDE_INT val = INTVAL (index);
- /* ??? Can we assume ldrd for thumb2? */
- /* Thumb-2 ldrd only has reg+const addressing modes. */
- /* ldrd supports offsets of +-1020.
- However the ldr fallback does not. */
- return val > -256 && val < 256 && (val & 3) == 0;
+ /* Thumb-2 ldrd only has reg+const addressing modes.
+ Assume we emit ldrd or 2x ldr if !TARGET_LDRD.
+ If vldr is selected it uses arm_coproc_mem_operand. */
+ if (TARGET_LDRD)
+ return IN_RANGE (val, -1020, 1020) && (val & 3) == 0;
+ else
+ return IN_RANGE (val, -255, 4095 - 4);
}
else
return 0;
ping From: Wilco Dijkstra Sent: 03 November 2016 12:20 To: GCC Patches Cc: nd Subject: [PATCH][ARM] Fix ldrd offsets Fix ldrd offsets of Thumb-2 - for TARGET_LDRD the range is +-1020, without -255..4091. This reduces the number of addressing instructions when using DI mode operations (such as in PR77308). Bootstrap & regress OK. ChangeLog: 2015-11-03 Wilco Dijkstra <wdijkstr@arm.com> gcc/ * config/arm/arm.c (arm_legitimate_index_p): Add comment. (thumb2_legitimate_index_p): Use correct range for DI/DF mode. --