[gcc r14-381] libgcc pru: Define TARGET_HAS_NO_HW_DIVIDE

[gcc r14-381] libgcc pru: Define TARGET_HAS_NO_HW_DIVIDE

[Dimitar Dimitrov]

https://gcc.gnu.org/g:1ee457a5febc8aa1e21d2298769bc70975f0206f

commit r14-381-g1ee457a5febc8aa1e21d2298769bc70975f0206f
Author: Dimitar Dimitrov <dimitar@dinux.eu>
Date:   Thu Apr 27 19:07:47 2023 +0300

    libgcc pru: Define TARGET_HAS_NO_HW_DIVIDE
    
    This patch aligns the configuration to the actual PRU capabilities. It
    also reduces the size of the affected libgcc functions.
    
    For a real-world project using integer arithmetics the savings
    are significant:
    
      Before:
         text    data     bss     dec     hex filename
         3688     865     544    5097    13e9 hc-sr04-range-sensor.elf
    
      With TARGET_HAS_NO_HW_DIVIDE defined:
         text    data     bss     dec     hex filename
         2824     865     544    4233    1089 hc-sr04-range-sensor.elf
    
    Execution speed also appears to have improved. The moddi3 function is
    now executed in half the CPU cycles.
    
    libgcc/ChangeLog:
    
            * config/pru/t-pru (HOST_LIBGCC2_CFLAGS): Add
            -DTARGET_HAS_NO_HW_DIVIDE.
    
    Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>

Diff:
---
 libgcc/config/pru/t-pru | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libgcc/config/pru/t-pru b/libgcc/config/pru/t-pru
index a5b1871e52d..7d5f5ee4261 100644
--- a/libgcc/config/pru/t-pru
+++ b/libgcc/config/pru/t-pru
@@ -42,6 +42,9 @@ LIB2ADD += \
 
 HOST_LIBGCC2_CFLAGS += -Os -ffunction-sections -fdata-sections
 
+# Use an appropriate implementation when implementing DImode division.
+HOST_LIBGCC2_CFLAGS += -DTARGET_HAS_NO_HW_DIVIDE
+
 LIB2FUNCS_EXCLUDE = _muldi3
 
 SHLIB_MAPFILES += $(srcdir)/config/pru/libgcc-eabi.ver