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libgcc pru: Define TARGET_HAS_NO_HW_DIVIDE

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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>
This commit is contained in:
Dimitar Dimitrov 2023-04-27 19:07:47 +03:00
parent 19a5b824ef
commit 1ee457a5fe
1 changed files with 3 additions and 0 deletions
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3
libgcc/config/pru/t-pru
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@ -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