Better handling of float conversions; more tests; converting to unsigned ints

works now.

mach/powerpc/mcg/table

@@ -392,17 +392,33 @@ PATTERNS
         emit "li32 %out.1, 0"
         cost 8;
 
-    out:(iret)reg = FROMF.I(in:(dret)reg)
+    out:(iret)reg = FROMSF.I(in:(dret)reg)
         with corrupted(volatile)
         emit "bl .fromf2i"
         cost 4;
 
-    out:(iret)reg = FROMD.I(in:(dret)reg)
+    out:(int)reg = FROMSD.I(in:(double)reg)
+        with preserved(%in)
+        emit "fctiwz %in, %in"
+        emit "stfdu %in, -8(sp)"
+        emit "lwz %out, 4(sp)"
+        emit "addi sp, sp, 8"
+        cost 16;
+
+    out:(int)reg = FROMUD.I(in:(double)reg)
         with corrupted(volatile)
-        emit "bl .fromd2i"
+        emit "stfdu %in, -8(sp)"
+        emit "bl .cfu8"
+        emit "lwz %out, 0(sp)"
+        emit "addi sp, sp, 4"
+        cost 16;
+
+    out:(lret)reg = FROMSF.L(in:(fret)reg)
+        with corrupted(volatile)
+        emit "bl .fromf2l"
         cost 4;
 
-    out:(lret)reg = FROMF.L(in:(fret)reg)
+    out:(lret)reg = FROMUF.I(in:(fret)reg)
         with corrupted(volatile)
         emit "bl .fromf2l"
         cost 4;

mach/proto/mcg/treebuilder.c

@@ -404,11 +404,11 @@ static void insn_simple(int opcode)
         case op_cii: simple_convert(IR_FROMSI); break;
         case op_ciu: simple_convert(IR_FROMSI); break;
         case op_cui: simple_convert(IR_FROMUI); break;
-        case op_cfu: simple_convert(IR_FROMF); break; /* FIXME: technically wrong */
-        case op_cfi: simple_convert(IR_FROMF); break;
+        case op_cfu: simple_convert(IR_FROMUF); break;
+        case op_cfi: simple_convert(IR_FROMSF); break;
         case op_cif: simple_convert(IR_FROMSI); break;
         case op_cuf: simple_convert(IR_FROMUI); break;
-        case op_cff: simple_convert(IR_FROMF); break;
+        case op_cff: simple_convert(IR_FROMSF); break;
 
         case op_cmp:
             push(

plat/qemuppc/tests/from_d_to_si_e.c

@@ -0,0 +1,20 @@
+#include "test.h"
+
+/* Constants in globals to defeat constant folding. */
+double one = 1.0;
+double zero = 0.0;
+double minusone = -1.0;
+double big = 2147483647.0;
+double minusbig = -2147483648.0;
+
+/* Bypasses the CRT, so there's no stdio or BSS initialisation. */
+void _m_a_i_n(void)
+{
+    ASSERT((int)zero == 0);
+    ASSERT((int)one == 1);
+    ASSERT((int)minusone == -1);
+    ASSERT((int)big == 2147483647);
+    ASSERT((int)minusbig == -2147483648);
+
+    finished();
+}

plat/qemuppc/tests/from_d_to_ui_e.c

@@ -0,0 +1,16 @@
+#include "test.h"
+
+/* Constants in globals to defeat constant folding. */
+double one = 1.0;
+double zero = 0.0;
+double big = 4294967295.0;
+
+/* Bypasses the CRT, so there's no stdio or BSS initialisation. */
+void _m_a_i_n(void)
+{
+    ASSERT((unsigned int)zero == 0);
+    ASSERT((unsigned int)one == 1);
+    ASSERT((unsigned int)big == 4294967295);
+
+    finished();
+}

util/mcgg/ir.dat

@@ -69,8 +69,10 @@ S ?=I. FROMUI
 S ?=L. FROMUL
 S ?=I. FROMSI
 S ?=L. FROMSL
-S ?=F. FROMF
-S ?=D. FROMD
+S ?=F. FROMUF
+S ?=D. FROMUD
+S ?=F. FROMSF
+S ?=D. FROMSD
 S L=II FROMIPAIR
 S I=L. FROML0
 S I=L. FROML1