fixed ultof and added tests

Author: ZERICO2005

src/crt/os.src

@@ -42,5 +42,3 @@ __sshru_b   := 000254h
 __stoi      := 000260h
 	public	__stoiu
 __stoiu     := 000264h
-	public	__ultof
-__ultof     := 000280h

src/crt/ultof.src

@@ -0,0 +1,29 @@
+	assume	adl=1
+
+	section	.text
+
+	public	__ultof
+
+; round to nearest ties to even
+__ultof:
+	bit	7, a
+	jp	z, __ltof	; common case
+	; A:UBC > INT32_MAX
+	res	7, a	; sets the LSB of the exponent
+	sla	c	; C = Round, NZ = Sticky
+	; A:UBC >>= 8
+	push	af
+	inc	sp
+	push	bc
+	inc	sp
+	pop	bc
+	inc	sp
+	ld	a, $4F	; sets the exponent
+	ret	nc	; round down
+	inc	bc
+	ret	nz	; round up (this will not overflow because bit 23 is 0)
+	; round to even
+	res	0, c
+	ret
+
+	extern	__ltof

src/include/ti84pceg.inc

@@ -2282,7 +2282,7 @@ namespace ti?
 ?_fcmp                     := 0000274h
 ?_fdiv                     := 0000278h
 ?_ftol                     := 000027Ch
-?_ultof                    := 0000280h
+;?_ultof                    := 0000280h
 ?_ltof                     := 0000284h
 ?_fmul                     := 0000288h
 ?_fneg                     := 000028Ch

test/floating_point/ultof/autotest.json

@@ -0,0 +1,43 @@
+{
+	"transfer_files": [
+	  "bin/DEMO.8xp"
+	],
+	"target": {
+	  "name": "DEMO",
+	  "isASM": true
+	},
+	"sequence": [
+	  "action|launch",
+	  "delay|1000",
+	  "hashWait|1",
+	  "key|enter",
+	  "delay|300",
+	  "hashWait|2"
+	],
+	"hashes": {
+	  "1": {
+		"description": "All tests passed or GDB1 error",
+		"timeout": 5000,
+		"start": "vram_start",
+		"size": "vram_16_size",
+		"expected_CRCs": [
+		  "38E2AD5A",
+		  "2C812DC2"
+		]
+	  },
+	  "2": {
+		"description": "Exit or GDB1 error",
+		"start": "vram_start",
+		"size": "vram_16_size",
+		"expected_CRCs": [
+		  "FFAF89BA",
+		  "101734A5",
+		  "9DA19F44",
+		  "A32840C8",
+		  "349F4775",
+		  "271A9FBF",
+		  "82FD0B1E"
+		]
+	  }
+	}
+}

test/floating_point/ultof/makefile

@@ -0,0 +1,17 @@
+# ----------------------------
+# Makefile Options
+# ----------------------------
+
+NAME = DEMO
+ICON = icon.png
+DESCRIPTION = "CE C Toolchain Demo"
+COMPRESSED = NO
+
+CFLAGS = -Wall -Wextra -Wshadow -Wfloat-conversion -Wimplicit-float-conversion -Wimplicit-int-float-conversion -O0
+CXXFLAGS = -Wall -Wextra -Wshadow -Wfloat-conversion -Wimplicit-float-conversion -Wimplicit-int-float-conversion -O0
+
+PREFER_OS_LIBC = NO
+
+# ----------------------------
+
+include $(shell cedev-config --makefile)

test/floating_point/ultof/src/main.c

@@ -0,0 +1,66 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <assert.h>
+#include <ti/screen.h>
+#include <ti/getcsc.h>
+#include <sys/util.h>
+
+#include "ultof_lut.h"
+
+typedef union F32_pun {
+    float flt;
+    uint32_t bin;
+} F32_pun;
+
+#define ARRAY_LENGTH(x) (sizeof(x) / sizeof(x[0]))
+
+void print_failed(uint32_t input, uint32_t guess, uint32_t truth) {
+    printf(
+        "I: %lu\nU: %08lX -->\nG: %08lX !=\nT: %08lX\n",
+        input, input, guess, truth
+    );
+}
+
+size_t run_test(void) {
+    typedef uint32_t input_t;
+    typedef F32_pun output_t;
+
+    const size_t length = ARRAY_LENGTH(ultof_LUT_input);
+    const input_t  *input  = (const input_t* )((const void*)ultof_LUT_input );
+    const output_t *output = (const output_t*)((const void*)ultof_LUT_output);
+
+    for (size_t i = 0; i < length; i++) {
+        F32_pun result;
+        
+        result.flt = (float)input[i];
+        if (result.bin != output[i].bin) {
+            // ignore round to maximum magnitude errors from __ltof
+            bool ignore_ltof_failure =
+                (input[i] <= INT32_MAX) &&
+                (result.bin == output[i].bin + 1);
+            if (ignore_ltof_failure == false) {
+                print_failed(input[i], result.bin, output[i].bin);
+                return i;
+            }
+        }
+    }
+
+    /* passed all */
+    return SIZE_MAX;
+}
+
+int main(void) {
+    os_ClrHome();
+    size_t fail_index = run_test();
+    if (fail_index == SIZE_MAX) {
+        printf("All tests passed");
+    } else {
+        printf("Failed test: %zu", fail_index);
+    }
+
+    while (!os_GetCSC());
+
+    return 0;
+}