test: math::floats fold-1 runtime regression
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5
Makefile
5
Makefile
@@ -328,6 +328,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
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$(BIN)/test_siphash_run \
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$(BIN)/test_checked_run \
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$(BIN)/test_f64cgen_run \
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$(BIN)/test_floats_run \
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$(BIN)/test_bufio_run $(BIN)/test_random_run
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$(BIN)/test_smoke: test/wcc/000_smoke.c $(LIB)/libwcc.a | $(BIN)
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@@ -1065,6 +1066,10 @@ $(BIN)/test_f64cgen_run: test/wcc/951_f64cgen_run.c $(BIN)/ww $(BIN)/w6c \
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$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
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$(CC) $(CFLAGS) -o $@ $<
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$(BIN)/test_floats_run: test/wcc/952_floats_run.c $(BIN)/ww $(BIN)/w6c \
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$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
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$(CC) $(CFLAGS) -o $@ $<
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sizelint:
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@sh tools/sizelint
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178
test/wcc/952_floats_run.c
Normal file
178
test/wcc/952_floats_run.c
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@@ -0,0 +1,178 @@
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/*
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* 952_floats_run — runtime regression net for lib/math/floats fold-1
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* (f64bits, f64frombits, isnan, isinf, signf64, absf64, copysignf64,
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* ispositivef64, isnegativef64). The classify/sign/bits surface rides
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* the f64-codegen paths fixed by #96 (deref-load -> MOVSD/X0) and #97
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* (compare consults PF for NaN); both stages emit byte-identical asm, so
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* the 990-997 byte-id gates can't catch a reintroduction — only an
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* executed-and-checked runtime probe can. This file is that probe.
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*
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* Table-driven like 951_f64cgen_run: each row is a self-contained ww
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* program importing math; the C-side cstage `ww build -I lib` compiles
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* it, we run the binary and assert the exit code. Self-checking rows
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* return 0 on pass / a locator code on the first failing assertion;
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* value-propagation rows return a computed result compared to want_exit.
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*
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* cstage-only by design (mirrors 951 + 969_checked_run): `ww_ww run` is
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* broken (#95) and per-program wwstage byte-id is the 990-997 gates' job.
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*
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* NaN/INF operands are built at runtime through opaque zero()/one() fns
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* so the checker can't const-fold them away (matches 951's #97 rows).
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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static int
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runwait(const char *cmd)
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{
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int rc = system(cmd);
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if (rc == -1) return -1;
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if (WIFEXITED(rc)) return WEXITSTATUS(rc);
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return 1;
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}
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struct row { const char *src; int want_exit; };
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static const struct row rows[] = {
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/* f64bits + f64frombits round-trip. 0x3FF0000000000000 == 1.0,
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* 0x4045000000000000 == 42.0. Round-trip through tobits/frombits
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* must preserve the bit pattern (both u64 and f64 deref-loads). */
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{ "package main;\n"
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"import math;\n"
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"export fn main() i32 = {\n"
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" if (math.f64bits(1.0) != 0x3FF0000000000000u64) { return 1; };\n"
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" if (math.f64bits(0.0) != 0u64) { return 2; };\n"
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" let rt: f64 = math.f64frombits(math.f64bits(-2.5));\n"
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" if (rt != -2.5) { return 3; };\n"
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" if (math.f64frombits(0x4045000000000000u64) != 42.0) { return 4; };\n"
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" return 0;\n"
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"};\n", 0 },
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/* f64frombits value propagation: a u64 bit pattern reinterpreted as
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* f64 then truncated to i32. On #96 the deref strands the value in a
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* GPR and the i32 cast reads stale X0. */
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{ "package main;\n"
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"import math;\n"
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"export fn main() i32 = {\n"
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" return math.f64frombits(0x4045000000000000u64): i32;\n"
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"};\n", 42 },
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/* isnan + isinf. Runtime NaN/INF via opaque zero()/one() so the
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* checker can't const-fold. isnan rides #97 (self-inequality must
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* be true for NaN); isinf rides #96 (f64bits deref-load). */
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{ "package main;\n"
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"import math;\n"
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"fn zero() f64 = { return 0.0; };\n"
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"fn one() f64 = { return 1.0; };\n"
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"export fn main() i32 = {\n"
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" let nan: f64 = zero() / zero();\n"
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" if (!math.isnan(nan)) { return 1; };\n"
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" if (math.isnan(1.0)) { return 2; };\n"
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" let inf: f64 = one() / zero();\n"
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" if (!math.isinf(inf)) { return 3; };\n"
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" if (!math.isinf(-inf)) { return 4; };\n"
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" if (math.isinf(nan)) { return 5; };\n"
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" if (math.isinf(1.23)) { return 6; };\n"
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" return 0;\n"
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"};\n", 0 },
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/* signf64 + ispositivef64 + isnegativef64. +0.0 has a clear sign
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* bit so signf64(0.0) == 1 (zero is positive). */
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{ "package main;\n"
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"import math;\n"
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"export fn main() i32 = {\n"
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" if (math.signf64(3.0) != 1i64) { return 1; };\n"
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" if (math.signf64(-3.0) != -1i64) { return 2; };\n"
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" if (math.signf64(0.0) != 1i64) { return 3; };\n"
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" if (!math.ispositivef64(3.0)) { return 4; };\n"
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" if (math.ispositivef64(-3.0)) { return 5; };\n"
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" if (!math.isnegativef64(-3.0)) { return 6; };\n"
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" if (math.isnegativef64(3.0)) { return 7; };\n"
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" return 0;\n"
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"};\n", 0 },
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/* absf64 + copysignf64. absf64(NaN) stays NaN (early return before
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* the bit-mask). copysign transfers y's sign onto x's magnitude. */
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{ "package main;\n"
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"import math;\n"
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"fn zero() f64 = { return 0.0; };\n"
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"export fn main() i32 = {\n"
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" if (math.absf64(-3.0) != 3.0) { return 1; };\n"
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" if (math.absf64(3.0) != 3.0) { return 2; };\n"
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" let nan: f64 = zero() / zero();\n"
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" if (!math.isnan(math.absf64(nan))) { return 3; };\n"
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" if (math.copysignf64(3.0, -1.0) != -3.0) { return 4; };\n"
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" if (math.copysignf64(-3.0, 1.0) != 3.0) { return 5; };\n"
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" if (math.copysignf64(3.0, 1.0) != 3.0) { return 6; };\n"
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" return 0;\n"
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"};\n", 0 },
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/* absf64 value propagation: f64 result truncated to i32 (rides #96
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* f64-return through X0). */
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{ "package main;\n"
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"import math;\n"
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"export fn main() i32 = {\n"
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" return math.absf64(-7.0): i32;\n"
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"};\n", 7 },
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{ NULL, 0 }
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};
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int
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main(void)
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{
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const char *bin = getenv("BIN");
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if (!bin) bin = "out/bin";
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char cwd[1024];
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if (getcwd(cwd, sizeof cwd) == NULL) return 1;
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char absbin[1024];
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if (bin[0] != '/') {
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snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
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bin = absbin;
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}
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int n = 0, fail = 0;
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for (int i = 0; rows[i].src; i++, n++) {
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char src[64];
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snprintf(src, sizeof src, "/tmp/wwflt_%d_%d.ww", getpid(), i);
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FILE *f = fopen(src, "wb");
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if (f == NULL) { fail++; continue; }
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fputs(rows[i].src, f);
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fclose(f);
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char tmpdir[64];
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snprintf(tmpdir, sizeof tmpdir, "/tmp/wwflt_%d_d_%d", getpid(), i);
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mkdir(tmpdir, 0755);
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char cmd[2048];
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snprintf(cmd, sizeof cmd, "cd %s && %s/ww build -I %s/lib %s",
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tmpdir, bin, cwd, src);
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if (runwait(cmd) != 0) {
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fprintf(stderr, "row %d: build failed\n src: %s\n",
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i, rows[i].src);
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fail++;
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unlink(src); rmdir(tmpdir);
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continue;
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}
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char outbin[128];
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const char *base = strrchr(src, '/');
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base = base ? base + 1 : src;
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snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
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char *dot = strrchr(outbin, '.');
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if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
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int got = runwait(outbin);
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if (got != rows[i].want_exit) {
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fprintf(stderr, "row %d: exit %d, want %d\n src: %s\n",
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i, got, rows[i].want_exit, rows[i].src);
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fail++;
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}
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unlink(src); unlink(outbin); rmdir(tmpdir);
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}
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if (fail) {
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fprintf(stderr, "%d/%d floats tests failed\n", fail, n);
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return 1;
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}
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printf("floats: %d/%d ok\n", n, n);
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return 0;
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}
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