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[arm] Implement soft-float abi
- From: Paul Brook <paul at codesourcery dot com>
- To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Cc: Richard Earnshaw <rearnsha at arm dot com>
- Date: Tue, 24 Aug 2004 02:47:55 +0100
- Subject: [arm] Implement soft-float abi
- Organization: CodeSourcery
The patch below allows use of hardware floating point while still conforming
to the soft-float ABI.
Tested with cross to arm-linux.
Ok?
Paul
2004-08-13 Paul Brook <paul@codesourcery.com>
* config/arm/arm.c (arm_override_options): Update error message.
* config/arm/arm.h (TARGET_HARD_FLOAT): Rename to
TARGET_HARD_FLOAT_ABI.
(TARGET_SOFT_FLOAT_ABI): Rename to TARGET_HARD_FLOAT.
(LIBCALL_VALUE, FUNCTION_VALUE_REGNO_P): Use TARGET_HARD_FLOAT_ABI.
Index: gcc/config/arm/arm.c
===================================================================
RCS file: /var/cvsroot/gcc-cvs/gcc/gcc/config/arm/arm.c,v
retrieving revision 1.394
diff -u -p -r1.394 arm.c
--- gcc/config/arm/arm.c 19 Aug 2004 17:02:02 -0000 1.394
+++ gcc/config/arm/arm.c 20 Aug 2004 15:16:12 -0000
@@ -1068,8 +1068,9 @@ arm_override_options (void)
arm_float_abi = ARM_FLOAT_ABI_HARD;
}
- if (arm_float_abi == ARM_FLOAT_ABI_SOFTFP)
- sorry ("-mfloat-abi=softfp");
+ if (arm_float_abi == ARM_FLOAT_ABI_HARD && TARGET_VFP)
+ sorry ("-mfloat-abi=hard and VFP");
+
/* If soft-float is specified then don't use FPU. */
if (TARGET_SOFT_FLOAT)
arm_fpu_arch = FPUTYPE_NONE;
Index: gcc/config/arm/arm.h
===================================================================
RCS file: /var/cvsroot/gcc-cvs/gcc/gcc/config/arm/arm.h,v
retrieving revision 1.251
diff -u -p -r1.251 arm.h
--- gcc/config/arm/arm.h 18 Aug 2004 17:05:03 -0000 1.251
+++ gcc/config/arm/arm.h 20 Aug 2004 14:13:52 -0000
@@ -268,8 +268,10 @@ extern GTY(()) rtx aof_pic_label;
#define TARGET_APCS_FLOAT (target_flags & ARM_FLAG_APCS_FLOAT)
#define TARGET_APCS_REENT (target_flags & ARM_FLAG_APCS_REENT)
#define TARGET_SOFT_FLOAT (arm_float_abi == ARM_FLOAT_ABI_SOFT)
-#define TARGET_SOFT_FLOAT_ABI (arm_float_abi != ARM_FLOAT_ABI_HARD)
-#define TARGET_HARD_FLOAT (arm_float_abi == ARM_FLOAT_ABI_HARD)
+/* Use hardware floating point instructions. */
+#define TARGET_HARD_FLOAT (arm_float_abi != ARM_FLOAT_ABI_SOFT)
+/* Use hardware floating point calling convention. */
+#define TARGET_HARD_FLOAT_ABI (arm_float_abi == ARM_FLOAT_ABI_HARD)
#define TARGET_FPA (arm_fp_model == ARM_FP_MODEL_FPA)
#define TARGET_MAVERICK (arm_fp_model == ARM_FP_MODEL_MAVERICK)
#define TARGET_VFP (arm_fp_model == ARM_FP_MODEL_VFP)
@@ -1552,10 +1554,10 @@ enum reg_class
/* Define how to find the value returned by a library function
assuming the value has mode MODE. */
#define LIBCALL_VALUE(MODE) \
- (TARGET_ARM && TARGET_HARD_FLOAT && TARGET_FPA \
+ (TARGET_ARM && TARGET_HARD_FLOAT_ABI && TARGET_FPA \
&& GET_MODE_CLASS (MODE) == MODE_FLOAT \
? gen_rtx_REG (MODE, FIRST_FPA_REGNUM) \
- : TARGET_ARM && TARGET_HARD_FLOAT && TARGET_MAVERICK \
+ : TARGET_ARM && TARGET_HARD_FLOAT_ABI && TARGET_MAVERICK \
&& GET_MODE_CLASS (MODE) == MODE_FLOAT \
? gen_rtx_REG (MODE, FIRST_CIRRUS_FP_REGNUM) \
: TARGET_IWMMXT_ABI && VECTOR_MODE_SUPPORTED_P (MODE) \
@@ -1575,10 +1577,10 @@ enum reg_class
#define FUNCTION_VALUE_REGNO_P(REGNO) \
((REGNO) == ARG_REGISTER (1) \
|| (TARGET_ARM && ((REGNO) == FIRST_CIRRUS_FP_REGNUM) \
- && TARGET_HARD_FLOAT && TARGET_MAVERICK) \
+ && TARGET_HARD_FLOAT_ABI && TARGET_MAVERICK) \
|| ((REGNO) == FIRST_IWMMXT_REGNUM && TARGET_IWMMXT_ABI) \
|| (TARGET_ARM && ((REGNO) == FIRST_FPA_REGNUM) \
- && TARGET_HARD_FLOAT && TARGET_FPA))
+ && TARGET_HARD_FLOAT_ABI && TARGET_FPA))
/* How large values are returned */
/* A C expression which can inhibit the returning of certain function values