Added soft float support for IA32 backend.

ir/be/ia32/bearch_ia32.c

@@ -53,6 +53,7 @@
 #include "iropt_t.h"
 #include "lower_dw.h"
 #include "lower_calls.h"
+#include "lower_softfloat.h"
 
 #include "../beabi.h"
 #include "../beirg.h"
@@ -1455,6 +1456,7 @@ static ia32_isa_t ia32_isa_template = {
 	NULL,                    /* types */
 	NULL,                    /* tv_ents */
 	NULL,                    /* abstract machine */
+	IA32_FPU_ARCH_X87,       /* FPU architecture */
 };
 
 static void init_asm_constraints(void)
@@ -2024,6 +2026,11 @@ static void ia32_lower_for_target(void)
 	/* lower compound param handling */
 	lower_calls_with_compounds(LF_RETURN_HIDDEN);
 
+	/* replace floating point operations by function calls */
+	if (ia32_cg_config.use_softfloat) {
+		lower_floating_point();
+	}
+
 	ir_prepare_dw_lowering(&lower_dw_params);
 	ir_lower_dw_ops();
 
@@ -2116,7 +2123,10 @@ static const backend_params *ia32_get_libfirm_params(void)
 	p.type_long_long          = type_long_long;
 	p.type_unsigned_long_long = type_unsigned_long_long;
 
-	if (! ia32_cg_config.use_sse2) {
+	if (ia32_cg_config.use_sse2 || ia32_cg_config.use_softfloat) {
+		p.mode_float_arithmetic = NULL;
+		p.type_long_double = NULL;
+	} else {
 		p.mode_float_arithmetic = mode_E;
 		ir_mode *mode = new_ir_mode("long double", irms_float_number, 80, 1,
 		                            irma_ieee754, 0);
@@ -2124,9 +2134,6 @@ static const backend_params *ia32_get_libfirm_params(void)
 		set_type_size_bytes(type, 12);
 		set_type_alignment_bytes(type, 4);
 		p.type_long_double = type;
-	} else {
-		p.mode_float_arithmetic = NULL;
-		p.type_long_double = NULL;
 	}
 	return &p;
 }

ir/be/ia32/bearch_ia32_t.h

@@ -68,6 +68,7 @@ struct ia32_isa_t {
 	pmap                  *types;           /**< A map of modes to primitivetypes */
 	pmap                  *tv_ent;          /**< A map of entities that store const tarvals */
 	const be_machine_t    *cpu;             /**< the abstract machine */
+	int                    fpu_arch;        /**< FPU architecture */
 };
 
 /**

ir/be/ia32/ia32_architecture.c

@@ -150,7 +150,7 @@ static int         opt_size             = 0;
 static int         emit_machcode        = 0;
 static cpu_support arch                 = cpu_generic;
 static cpu_support opt_arch             = cpu_generic;
-static int         use_sse2             = 0;
+static int         fpu_arch             = 0;
 static int         opt_cc               = 1;
 static int         opt_unsafe_floatconv = 0;
 
@@ -222,13 +222,14 @@ static lc_opt_enum_int_var_t opt_arch_var = {
 };
 
 static const lc_opt_enum_int_items_t fp_unit_items[] = {
-	{ "x87" ,    0 },
-	{ "sse2",    1 },
-	{ NULL,      0 }
+	{ "x87" ,      IA32_FPU_ARCH_X87 },
+	{ "sse2",      IA32_FPU_ARCH_SSE2 },
+	{ "softfloat", IA32_FPU_ARCH_SOFTFLOAT },
+	{ NULL,        IA32_FPU_ARCH_NONE }
 };
 
 static lc_opt_enum_int_var_t fp_unit_var = {
-	&use_sse2, fp_unit_items
+	&fpu_arch, fp_unit_items
 };
 
 static const lc_opt_table_entry_t ia32_architecture_options[] = {
@@ -881,7 +882,8 @@ void ia32_setup_cg_config(void)
 	/* P4s don't like inc/decs because they only partially write the flags
 	 * register which produces false dependencies */
 	c->use_incdec           = !FLAGS(opt_arch, arch_netburst | arch_nocona | arch_core2 | arch_geode) || opt_size;
-	c->use_sse2             = use_sse2 && FLAGS(arch, arch_feature_sse2);
+	c->use_softfloat        = FLAGS(fpu_arch, IA32_FPU_ARCH_SOFTFLOAT);
+	c->use_sse2             = FLAGS(fpu_arch, IA32_FPU_ARCH_SSE2) && FLAGS(arch, arch_feature_sse2);
 	c->use_ffreep           = FLAGS(opt_arch, arch_athlon_plus);
 	c->use_ftst             = !FLAGS(arch, arch_feature_p6_insn);
 	/* valgrind can't cope with femms yet and the usefulness of the optimization

ir/be/ia32/ia32_architecture.h

@@ -33,6 +33,8 @@ typedef struct {
 	unsigned use_leave:1;
 	/** use inc, dec instead of add $1, reg and add $-1, reg */
 	unsigned use_incdec:1;
+	/** use soft float library */
+	unsigned use_softfloat:1;
 	/** use sse2 instructions (instead of x87) */
 	unsigned use_sse2:1;
 	/** use ffreep instead of fpop */
@@ -104,6 +106,14 @@ typedef struct {
 
 extern ia32_code_gen_config_t  ia32_cg_config;
 
+typedef enum ia32_fp_architectures {
+	IA32_FPU_ARCH_NONE      = 0,
+	IA32_FPU_ARCH_X87       = 0x00000001,
+	IA32_FPU_ARCH_SSE2      = 0x00000002,
+	IA32_FPU_ARCH_SOFTFLOAT = 0x00000004,
+}
+ia32_fp_architectures;
+
 /** Initialize the ia32 architecture module. */
 void ia32_init_architecture(void);