From 1ee457a5febc8aa1e21d2298769bc70975f0206f Mon Sep 17 00:00:00 2001
From: Dimitar Dimitrov <dimitar@dinux.eu>
Date: Thu, 27 Apr 2023 19:07:47 +0300
Subject: [PATCH] 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>
---
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 a5b1871e52d4..7d5f5ee4261b 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
--
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