From: Jojo R <jiejie_rong@c-sky.com>
Date: Fri, 31 Jul 2020 07:18:25 +0000 (+0800)
Subject: C-SKY: Add -mfloat-abi= option.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=197f1e8c14306fc97ff91f9fb4262e70f45eedef;p=gcc.git

C-SKY: Add -mfloat-abi= option.

gcc/ChangeLog:

	* config/csky/csky_opts.h (float_abi_type): New.
	* config/csky/csky.h (TARGET_SOFT_FLOAT): New.
	(TARGET_HARD_FLOAT): New.
	(TARGET_HARD_FLOAT_ABI): New.
	(OPTION_DEFAULT_SPECS): Use mfloat-abi.
	* config/csky/csky.opt (mfloat-abi): New.
	* doc/invoke.texi (C-SKY Options): Document -mfloat-abi=.
---

diff --git a/gcc/config/csky/csky.h b/gcc/config/csky/csky.h
index 2d5a66ca187..8f4090b4b38 100644
--- a/gcc/config/csky/csky.h
+++ b/gcc/config/csky/csky.h
@@ -126,6 +126,13 @@
 #define TARGET_TLS \
   (CSKY_TARGET_ARCH (CK807) || CSKY_TARGET_ARCH (CK810))
 
+/* Run-time Target Specification.  */
+#define TARGET_SOFT_FLOAT       (csky_float_abi == CSKY_FLOAT_ABI_SOFT)
+/* Use hardware floating point instructions. */
+#define TARGET_HARD_FLOAT       (csky_float_abi != CSKY_FLOAT_ABI_SOFT)
+/* Use hardware floating point calling convention.  */
+#define TARGET_HARD_FLOAT_ABI   (csky_float_abi == CSKY_FLOAT_ABI_HARD)
+
 /* Number of loads/stores handled by ldm/stm.  */
 #define CSKY_MIN_MULTIPLE_STLD	3
 #define CSKY_MAX_MULTIPLE_STLD	12
@@ -818,7 +825,7 @@ while (0)
   {"arch", "%{!march=*:%{!mcpu=*:-march=%(VALUE)}}" }, \
   {"cpu", "%{!march=*:%{!mcpu=*:-mcpu=%(VALUE)}}" }, \
   {"endian", "%{!mbig-endian:%{!mlittle-endian:-m%(VALUE)-endian}}" }, \
-  {"float", "%{!msoft-float:%{!mhard-float:-m%(VALUE)-float}}" },
+  {"float", "%{!mfloat-abi=*:-mfloat-abi=%(VALUE)}" },
 
 
 /******************************************************************
diff --git a/gcc/config/csky/csky.opt b/gcc/config/csky/csky.opt
index 5846e50344f..60b51e5798f 100644
--- a/gcc/config/csky/csky.opt
+++ b/gcc/config/csky/csky.opt
@@ -57,12 +57,33 @@ Target RejectNegative Report Alias(mlittle-endian) Undocumented
 ;; assembly.
 
 mhard-float
-Target Report RejectNegative Mask(HARD_FLOAT)
-Enable hardware floating-point instructions.
+Target RejectNegative Alias(mfloat-abi=, hard) Undocumented
 
 msoft-float
-Target Report RejectNegative InverseMask(HARD_FLOAT)
-Use library calls to perform floating-point operations (default).
+Target RejectNegative Alias(mfloat-abi=, soft) Undocumented
+
+mfloat-abi=v2
+Target RejectNegative Alias(mfloat-abi=, hard) Undocumented
+
+mfloat-abi=v1
+Target RejectNegative Alias(mfloat-abi=, softfp) Undocumented
+
+mfloat-abi=
+Target RejectNegative Joined Enum(float_abi_type) Var(csky_float_abi) Init(CSKY_FLOAT_ABI_SOFT)
+Specify if floating point hardware should be used.
+
+Enum
+Name(float_abi_type) Type(enum float_abi_type)
+Known floating-point ABIs (for use with the -mfloat-abi= option):
+
+EnumValue
+Enum(float_abi_type) String(soft) Value(CSKY_FLOAT_ABI_SOFT)
+
+EnumValue
+Enum(float_abi_type) String(softfp) Value(CSKY_FLOAT_ABI_SOFTFP)
+
+EnumValue
+Enum(float_abi_type) String(hard) Value(CSKY_FLOAT_ABI_HARD)
 
 mfpu=
 Target RejectNegative Joined Enum(csky_fpu) Var(csky_fpu_index) Init(TARGET_FPU_auto) Save
diff --git a/gcc/config/csky/csky_opts.h b/gcc/config/csky/csky_opts.h
index a6dbf5ab6dd..7ee56be3e81 100644
--- a/gcc/config/csky/csky_opts.h
+++ b/gcc/config/csky/csky_opts.h
@@ -59,5 +59,12 @@ enum csky_fpu_type
 };
 #define CSKY_TARGET_FPU_GET(name) TARGET_FPU_ ## name
 
+enum float_abi_type
+{
+  CSKY_FLOAT_ABI_SOFT,
+  CSKY_FLOAT_ABI_SOFTFP,
+  CSKY_FLOAT_ABI_HARD
+};
+
 
 #endif /* CSKY_OPTS_H */
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 5a5159d39b3..060d73ed0c5 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -820,6 +820,7 @@ Objective-C and Objective-C++ Dialects}.
 @gccoptlist{-march=@var{arch}  -mcpu=@var{cpu} @gol
 -mbig-endian  -EB  -mlittle-endian  -EL @gol
 -mhard-float  -msoft-float  -mfpu=@var{fpu}  -mdouble-float  -mfdivdu @gol
+-mfloat-abi=@var{name} @gol
 -melrw  -mistack  -mmp  -mcp  -mcache  -msecurity  -mtrust @gol
 -mdsp  -medsp  -mvdsp @gol
 -mdiv  -msmart  -mhigh-registers  -manchor @gol
@@ -20646,6 +20647,23 @@ Specify the C-SKY target processor.  Valid values for @var{cpu} are:
 
 Select big- or little-endian code.  The default is little-endian.
 
+@item -mfloat-abi=@var{name}
+@opindex mfloat-abi
+Specifies which floating-point ABI to use.  Permissible values
+are: @samp{soft}, @samp{softfp} and @samp{hard}.
+
+Specifying @samp{soft} causes GCC to generate output containing
+library calls for floating-point operations.
+@samp{softfp} allows the generation of code using hardware floating-point
+instructions, but still uses the soft-float calling conventions.
+@samp{hard} allows generation of floating-point instructions
+and uses FPU-specific calling conventions.
+
+The default depends on the specific target configuration.  Note that
+the hard-float and soft-float ABIs are not link-compatible; you must
+compile your entire program with the same ABI, and link with a
+compatible set of libraries.
+
 @item -mhard-float
 @opindex mhard-float
 @itemx -msoft-float