From 74e0c8c8f675fc9e07a04e15960cbf1ac2f98997 Mon Sep 17 00:00:00 2001
From: Apaczer <94932128+Apaczer@users.noreply.github.com>
Date: Thu, 13 Mar 2025 23:12:39 +0100
Subject: [PATCH] Makefile.libretro: add MIYOO optimize flags

with PGO instructions (no LTO cuz we target dynamic linking here), also reduce optimization to -O2 for profiler
---
 Makefile.libretro | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/Makefile.libretro b/Makefile.libretro
index 2197946c..1b0f7a2e 100644
--- a/Makefile.libretro
+++ b/Makefile.libretro
@@ -607,13 +607,35 @@ else ifneq (,$(findstring armv,$(platform)))
 
 else ifeq ($(platform), miyoo)
 	TARGET := $(TARGET_NAME)_libretro.so
-	fpic := -fPIC
-	CFLAGS += -mcpu=arm926ej-s -fsingle-precision-constant
+	LIBC ?= $(shell $(CC) -print-file-name=libc.so | grep -q musl && echo "musl" || echo "glibc")
+ifeq ($(LIBC),musl)
+	fpic := -fPIC # brakes otherwise shared object core when profiling with gcc
+else
+	fpic := -fno-PIC
+endif
+	CFLAGS += -mcpu=arm926ej-s -fsingle-precision-constant \
+	-O2 -fdata-sections -ffunction-sections -fsingle-precision-constant
 	CFLAGS += -DGPU_UNAI_USE_INT_DIV_MULTINV -D_MIYOO
+	CFLAGS += -fno-common -fno-ipa-cp -fno-caller-saves -fno-regmove -finline-limit=42 \
+	-fuse-linker-plugin \
+	-fno-stack-protector -fno-ident -fomit-frame-pointer \
+	-fno-unroll-loops -ffast-math \
+	-marm
+	CXXFLAGS += $(CFLAGS)
+	CPPFLAGS += $(CFLAGS)
+	ASFLAGS += $(CFLAGS)
+	THREAD_RENDERING := 1
 	ARCH = arm
 	BUILTIN_GPU = unai
 	DYNAREC = ari64
 	HAVE_NEON = 0
+	BASE_ADDR_DYNAMIC := 1
+ifeq ($(PROFILE), YES)
+	CFLAGS += -fprofile-generate=/mnt/profile # rm path if you want dir structure intact at runtime
+	LDFLAGS += -lgcov
+else ifeq ($(PROFILE), APPLY)
+	CFLAGS += -fprofile-use -fbranch-probabilities -Wno-error=coverage-mismatch
+endif
 
 # Emscripten
 else ifeq ($(platform), emscripten)
-- 
2.45.2.windows.1