ww/test/wcc/946_floatarr_run.c

/*
 * 946_floatarr_run — runtime + byte-id net for #119: a float ARRAY
 * ELEMENT load must land in X0 (MOVSS/MOVSD), not the integer register
 * file (MOVQ → AX). cgindex's element-load sites ended in the integer
 * loadopsz, so `let a: [3]f64 = [...]; a[0] + a[1]` loaded the element
 * into AX while the consumer's ADDSD read a stale X0 → wrong sum. #119
 * adds a float-element branch (MOVSS f32 / MOVSD f64 into X0) at all
 * three wwstage cgindex sites (global, baselocal, fallback) and both
 * cstage N_INDEX element-load sites, deriving float-ness from the same
 * stamped element tinfo the esz already reads (elemisfloatc/elemisf32c
 * for ident bases, typeisfloat/typeisf32(n.type_) for N_DOT/N_INDEX
 * bases — never an unstamped node-stamp, dodging the #121 trap).
 *
 * #119 also required a wwstage exprfloatkind N_INDEX arm: the consumer
 * (cgbin / cgcast) classified an indexed float operand as INTEGER and
 * fell to PUSHQ/ADDQ/MOVSXD, while the cstage read the stamped operand
 * type and used ADDSD/CVTTSD2SI — a rule-10 divergence the load fix
 * exposed. The N_INDEX result type_ is checker-stamped (cgindex reads
 * it for esz), so this is not the unstamped-N_MLET case deferred under
 * #121.
 *
 * Each row carries (a) a cstage `ww build` + run asserting the exit
 * code, and (b) a w6c vs w6c_ww `.s` cmp (rule-10 byte-id). A row whose
 * want_exit is RUN_SKIP runs only the byte-id leg: the f32 row exercises
 * the f32 LOAD + cs==ww but its runtime VALUE is blocked by a SEPARATE,
 * pre-existing bug — the f32 array-element STORE writes AX (the raw
 * double low-bits) instead of the CVTSD2SS-narrowed X0 single, so every
 * f32 array slot reads back 0.0f. That store-side twin is filed
 * separately (#119-store); this probe still proves the f32 LOAD shape +
 * cs==ww byte-identity.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>

#define RUN_SKIP (-1)

static int
runwait(const char *cmd)
{
	int rc = system(cmd);
	if (rc == -1) return -1;
	if (WIFEXITED(rc)) return WEXITSTATUS(rc);
	return -1;
}

struct row { const char *label; const char *src; int want_exit; };

static const struct row rows[] = {
	/* f64 element load + float add: 1.5 + 2.5 == 4.0. On the bug the
	 * elements loaded into AX and the ADDSD read a stale X0 -> != 4.0. */
	{ "f64_arith",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]f64 = [1.5, 2.5, 9.0];\n"
	  "	if (a[0] + a[1] != 4.0) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	/* f64 element -> i32 cast: 1.5 truncates to 1. On the bug the cast
	 * operand classified integer (MOVSXD on AX) not CVTTSD2SI on X0. */
	{ "f64_trunc",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]f64 = [1.5, 2.5, 9.0];\n"
	  "	return a[0]: i32;\n"
	  "};\n", 1 },
	/* third element, non-adjacent index: a[2] == 9.0. */
	{ "f64_elem2",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]f64 = [1.5, 2.5, 9.0];\n"
	  "	if (a[2] != 9.0) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	/* f32 element load (MOVSS into X0) + add, suffixed literals so
	 * fold-1 narrows them. BYTE-ID ONLY: the runtime value is blocked by
	 * the f32 array-element STORE bug (#119-store), so we assert only
	 * that both stages emit the same (correct-load) asm. */
	{ "f32_arith_byteid",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let b: [2]f32 = [1.5f32, 2.5f32];\n"
	  "	if ((b[0] + b[1]): f64 != 4.0) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", RUN_SKIP },
	{ NULL, NULL, 0 }
};

static int
slurp_eq(const char *a, const char *b)
{
	FILE *fa = fopen(a, "rb");
	FILE *fb = fopen(b, "rb");
	if (!fa || !fb) { if (fa) fclose(fa); if (fb) fclose(fb); return -1; }
	int rc = 0;
	for (;;) {
		int ca = fgetc(fa);
		int cb = fgetc(fb);
		if (ca != cb) { rc = -1; break; }
		if (ca == EOF) break;
	}
	fclose(fa); fclose(fb);
	return rc;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[1024];
	if (bin[0] != '/') {
		char cwd[1024];
		if (getcwd(cwd, sizeof cwd) == NULL) return 1;
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}

	char w6c[1100], w6c_ww[1100];
	snprintf(w6c, sizeof w6c, "%s/w6c", bin);
	snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);
	if (access(w6c_ww, X_OK) != 0) {
		fprintf(stderr, "floatarr: w6c_ww missing — cannot run the "
		    "cs==ww byte-id gate (the whole point of this test)\n");
		return 1;
	}

	int n = 0, fail = 0;
	for (int i = 0; rows[i].src; i++, n++) {
		char src[64];
		snprintf(src, sizeof src, "/tmp/wwfarr_%d_%d.ww", getpid(), i);
		FILE *f = fopen(src, "wb");
		if (f == NULL) { fail++; continue; }
		fputs(rows[i].src, f);
		fclose(f);

		/* (a) cstage build + run (skipped for byte-id-only rows). */
		if (rows[i].want_exit != RUN_SKIP) {
			char tmpdir[64];
			snprintf(tmpdir, sizeof tmpdir, "/tmp/wwfarr_%d_d_%d",
			    getpid(), i);
			mkdir(tmpdir, 0755);

			char cmd[2048];
			snprintf(cmd, sizeof cmd, "cd %s && %s/ww build %s",
			    tmpdir, bin, src);
			if (runwait(cmd) != 0) {
				fprintf(stderr, "row[%s]: cstage build failed\n",
				    rows[i].label);
				fail++;
				unlink(src); rmdir(tmpdir);
				continue;
			}

			char outbin[128];
			const char *base = strrchr(src, '/');
			base = base ? base + 1 : src;
			snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
			char *dot = strrchr(outbin, '.');
			if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';

			int got = runwait(outbin);
			if (got != rows[i].want_exit) {
				fprintf(stderr, "row[%s]: cstage exit %d, want %d\n",
				    rows[i].label, got, rows[i].want_exit);
				fail++;
			}
			unlink(outbin); rmdir(tmpdir);
		}

		/* (b) cs==ww byte-id gate: emit .s from both stages, cmp. */
		char cs_s[64], ws_s[64];
		snprintf(cs_s, sizeof cs_s, "/tmp/wwfarr_%d_%d_cs.s",
		    getpid(), i);
		snprintf(ws_s, sizeof ws_s, "/tmp/wwfarr_%d_%d_ww.s",
		    getpid(), i);

		char cmd[2048];
		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
		    w6c, cs_s, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: w6c failed\n", rows[i].label);
			fail++; unlink(src); continue;
		}
		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
		    w6c_ww, ws_s, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: w6c_ww failed\n",
			    rows[i].label);
			fail++; unlink(src); unlink(cs_s); continue;
		}
		if (slurp_eq(cs_s, ws_s) != 0) {
			fprintf(stderr,
			    "row[%s]: cstage/wwstage .s DIFFER (rule-10 "
			    "byte-id violation)\n", rows[i].label);
			fail++;
		}
		unlink(src); unlink(cs_s); unlink(ws_s);
	}

	if (fail) {
		fprintf(stderr, "%d/%d float-array element tests failed\n",
		    fail, n);
		return 1;
	}
	printf("floatarr: %d/%d ok (cstage run + cs==ww byte-id)\n", n, n);
	return 0;
}