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[cadcdev-svn-commits] [SCM] branch master updated. v2.0.0-1255-gaf86ae5
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From: ljsebald <ljs...@us...> - 2024-01-11 23:14:24
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This is an automated email from the git hooks/post-receive script. It was
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the project "A pseudo Operating System for the Dreamcast.".
The branch, master has been updated
via af86ae57218ec25e374581d0a13e84382ed22d71 (commit)
from 1d95eff07fa77034e006d5eb4cc6c26925ce8ef8 (commit)
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- Log -----------------------------------------------------------------
commit af86ae57218ec25e374581d0a13e84382ed22d71
Author: darcagn <da...@pr...>
Date: Thu Jan 11 17:13:25 2024 -0600
Add environ variable for SH4 floating point precision configuration (#460)
* Add environ variable for SH4 floating point precision configuration
* Remove extraneous whitespace from environ.sh.sample
* Use more stern language for SH4 precision setting
-----------------------------------------------------------------------
Summary of changes:
doc/environ.sh.sample | 57 ++++++++++++++++++++++++++++++++-------------------
environ_dreamcast.sh | 13 ++++++++----
2 files changed, 45 insertions(+), 25 deletions(-)
diff --git a/doc/environ.sh.sample b/doc/environ.sh.sample
index 958a6b9..17fc83a 100644
--- a/doc/environ.sh.sample
+++ b/doc/environ.sh.sample
@@ -2,22 +2,22 @@
#
# This is a sample script for configuring and customizing your
# KOS build environment. Modify it to suit your setup. Several
-# settings may be enabled optionally or are provided with
+# settings may be enabled optionally or are provided with
# alternative values.
#
-# This script is typically sourced in your current shell environment
+# This script is typically sourced in your current shell environment
# (probably by .bashrc, .bash_profile, or something similar), so that
# the KOS environment is set up automatically for each shell session.
#
-# Build Architecture
+# Build Architecture
#
# Set the major architecture you'll be building for.
# The only option here is "dreamcast" as of KOS 2.0.0.
#
export KOS_ARCH="dreamcast"
-# Build Sub-Architecture
+# Build Sub-Architecture
#
# Defines the sub architecture your configuration
# is targeting or uses an existing value that
@@ -47,15 +47,15 @@ export KOS_PORTS="${KOS_BASE}/../kos-ports"
# SH Compiler Prefixes
#
-# Specifies the path to and prefix for the main SH
+# Specifies the path to and prefix for the main SH
# GCC toolchain used to target the Dreamcast's SH4 CPU.
#
-export KOS_CC_BASE="/opt/toolchains/dc/sh-elf"
+export KOS_CC_BASE="/opt/toolchains/dc/sh-elf"
export KOS_CC_PREFIX="sh-elf"
# ARM Compiler Prefixes
#
-# Specifies the path to and prefix for the additional ARM
+# Specifies the path to and prefix for the additional ARM
# GCC toolchain used to target the Dreamcast's AICA SPU.
#
export DC_ARM_BASE="/opt/toolchains/dc/arm-eabi"
@@ -78,8 +78,8 @@ export KOS_GENROMFS="${KOS_BASE}/utils/genromfs/genromfs"
# Make Utility
#
# Configures the tool to be used as the main "make" utility
-# for building GNU Makefiles. On a platform such as BSD,
-# the default can be changed to "gmake," for the GNU
+# for building GNU Makefiles. On a platform such as BSD,
+# the default can be changed to "gmake," for the GNU
# implementation.
#
export KOS_MAKE="make"
@@ -93,9 +93,9 @@ export KOS_MAKE="make"
# or dc-tool-serial configuration, remembering to change the values
# for the Dreamcast's IP address or the serial port interface.
#
-export KOS_LOADER="dc-tool -x"
+export KOS_LOADER="dc-tool -x"
#export KOS_LOADER="dc-tool-ip -t 192.168.1.100 -x"
-#export KOS_LOADER="dc-tool-ser -t /dev/ttyS0 -x"
+#export KOS_LOADER="dc-tool-ser -t /dev/ttyS0 -x"
# Default Compiler Flags
#
@@ -109,19 +109,19 @@ export KOS_LDFLAGS=""
export KOS_AFLAGS=""
export DC_ARM_LDFLAGS=""
-# Optimization Level
+# Optimization Level
#
-# Controls the baseline optimization level to use when building.
+# Controls the baseline optimization level to use when building.
# Typically this is -Og (debugging), -O0, -01, -02, or -03.
-# NOTE: For our target, -O4 is a valid optimization level that has
+# NOTE: For our target, -O4 is a valid optimization level that has
# been seen to have some performance impact as well.
#
export KOS_CFLAGS="${KOS_CFLAGS} -O2"
# Additional Optimizations
#
-# Uncomment this to enable what has been found empirically to be
-# the optimal set of additional flags for release build performance
+# Uncomment this to enable what has been found empirically to be
+# the optimal set of additional flags for release build performance
# on the current stable toolchain. NOTE: Certain KOS-ports and examples
# do not work properly with "-flto=auto"!
#
@@ -130,18 +130,18 @@ export KOS_CFLAGS="${KOS_CFLAGS} -O2"
# Frame Pointers
#
# Controls whether frame pointers are emitted or not. Disabled by
-# default. Enable them if you plan to use GDB for debugging.
+# default. Enable them if you plan to use GDB for debugging.
#
export KOS_CFLAGS="${KOS_CFLAGS} -fomit-frame-pointer"
#export KOS_CFLAGS="${KOS_CFLAGS} -fno-omit-frame-pointer -DFRAME_POINTERS"
# GCC Builtin Functions
#
-# Comment out this line to enable GCC to use its own builtin implementations of
+# Comment out this line to enable GCC to use its own builtin implementations of
# certain standard library functions. Under certain conditions, this can allow
# compiler-optimized implementations to replace standard function invocations.
# The downside of this is that it COULD interfere with Newlib or KOS implementations
-# of these functions, and it has not been tested thoroughly to ensure compatibility.
+# of these functions, and it has not been tested thoroughly to ensure compatibility.
#
export KOS_CFLAGS="${KOS_CFLAGS} -fno-builtin"
@@ -155,6 +155,20 @@ export KOS_CFLAGS="${KOS_CFLAGS} -fno-builtin"
#
# export KOS_CFLAGS="${KOS_CFLAGS} -ffast-math -ffp-contract=fast -mfsrra -mfsca"
+# SH4 Floating Point Arithmetic Precision
+#
+# KallistiOS only officially supports the single-precision-only floating-point
+# arithmetic mode (-m4-single-only), but double precision default (-m4) or
+# double precision, single default (-m4-single) modes can be enabled here by
+# adjusting KOS_SH4_PRECISION.
+# WARNING: Adjusting this setting has a high likelihood of breaking KallistiOS,
+# kos-ports, and existing codebases which assume -m4-single-only.
+# Do not touch this setting unless you know what you are doing!
+# NOTE: Altering this setting also requires your toolchain to have been built
+# with support for these modes, which is not the case by default!
+#
+export KOS_SH4_PRECISION="-m4-single-only"
+
# Additional Tools Path
#
# If not already set, add "bin" directory to PATH variable, which is where
@@ -167,8 +181,9 @@ fi
# Shared Compiler Configuration
#
-# Include sub architecture-independent configuration file for shared
-# environment settings. If you want to configure additional compiler
+# Include sub architecture-independent configuration file for shared
+# environment settings. If you want to configure additional compiler
# options or see where other build flags are set, look at this file.
#
. ${KOS_BASE}/environ_base.sh
+
diff --git a/environ_dreamcast.sh b/environ_dreamcast.sh
index cb092da..7108f2c 100644
--- a/environ_dreamcast.sh
+++ b/environ_dreamcast.sh
@@ -1,14 +1,19 @@
# KallistiOS environment variable settings. These are the shared pieces
# for the Dreamcast(tm) platform.
-export KOS_CFLAGS="${KOS_CFLAGS} -ml -m4-single-only -ffunction-sections -fdata-sections -matomic-model=soft-imask -ftls-model=local-exec"
+# Default the SH4 floating point precision if it isn't already set.
+if [ -z "${KOS_SH4_PRECISION}" ] ; then
+ export KOS_SH4_PRECISION="-m4-single-only"
+fi
+
+export KOS_CFLAGS="${KOS_CFLAGS} ${KOS_SH4_PRECISION} -ml -ffunction-sections -fdata-sections -matomic-model=soft-imask -ftls-model=local-exec"
export KOS_AFLAGS="${KOS_AFLAGS} -little"
if [ x${KOS_SUBARCH} = xnaomi ]; then
- export KOS_LDFLAGS="${KOS_LDFLAGS} -ml -m4-single-only -Wl,-Ttext=0x8c020000 -Wl,--gc-sections"
+ export KOS_LDFLAGS="${KOS_LDFLAGS} ${KOS_SH4_PRECISION} -ml -Wl,-Ttext=0x8c020000 -Wl,--gc-sections"
export KOS_LD_SCRIPT="-T${KOS_BASE}/utils/ldscripts/shlelf-naomi.xc"
else
- export KOS_LDFLAGS="${KOS_LDFLAGS} -ml -m4-single-only -Wl,-Ttext=0x8c010000 -Wl,--gc-sections"
+ export KOS_LDFLAGS="${KOS_LDFLAGS} ${KOS_SH4_PRECISION} -ml -Wl,-Ttext=0x8c010000 -Wl,--gc-sections"
export KOS_LD_SCRIPT="-T${KOS_BASE}/utils/ldscripts/shlelf.xc"
fi
@@ -25,5 +30,5 @@ if [ x${KOS_ARCH} = xdreamcast ]; then
export DC_ARM_START="${KOS_ARCH_DIR}/sound/arm/crt0.s"
export DC_ARM_LDFLAGS="${DC_ARM_LDFLAGS} -Wl,-Ttext=0x00000000,-N -nostartfiles -nostdlib -e reset"
export DC_ARM_LIB_PATHS=""
- export DC_ARM_LIBS="-Wl,--start-group -lgcc -Wl,--end-group"
+ export DC_ARM_LIBS="-Wl,--start-group -lgcc -Wl,--end-group"
fi
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A pseudo Operating System for the Dreamcast.
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