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GET /api/patches/2195374/?format=api
{ "id": 2195374, "url": "http://patchwork.ozlabs.org/api/patches/2195374/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260210214044.1174699-6-iii@linux.ibm.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260210214044.1174699-6-iii@linux.ibm.com>", "list_archive_url": null, "date": "2026-02-10T21:39:04", "name": "[v5,5/5] tests/tcg/s390x: Test DIVIDE TO INTEGER", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "aadabfd01d4a5ef04b49ecc709cba27baf223635", "submitter": { "id": 74525, "url": "http://patchwork.ozlabs.org/api/people/74525/?format=api", "name": "Ilya Leoshkevich", "email": "iii@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260210214044.1174699-6-iii@linux.ibm.com/mbox/", "series": [ { "id": 491741, "url": "http://patchwork.ozlabs.org/api/series/491741/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491741", "date": "2026-02-10T21:39:00", "name": "target/s390x: Implement DIVIDE TO INTEGER", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/491741/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195374/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195374/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=jk/Kn5KW;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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envelope-from=iii@linux.ibm.com;\n helo=mx0a-001b2d01.pphosted.com", "X-Spam_score_int": "-19", "X-Spam_score": "-2.0", "X-Spam_bar": "--", "X-Spam_report": "(-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Add a test to prevent regressions. Data is generated using a\nlibFuzzer-based fuzzer and hopefully covers all the important corner\ncases.\n\nAcked-by: Alex Bennée <alex.bennee@linaro.org>\nSigned-off-by: Ilya Leoshkevich <iii@linux.ibm.com>\n---\n tests/tcg/s390x/Makefile.target | 5 +\n tests/tcg/s390x/divide-to-integer.c | 265 ++++++++++++++++++++++++++++\n 2 files changed, 270 insertions(+)\n create mode 100644 tests/tcg/s390x/divide-to-integer.c", "diff": "diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target\nindex da5fe71a407..0ca030ded01 100644\n--- a/tests/tcg/s390x/Makefile.target\n+++ b/tests/tcg/s390x/Makefile.target\n@@ -49,14 +49,19 @@ TESTS+=cvd\n TESTS+=cvb\n TESTS+=ts\n TESTS+=ex-smc\n+TESTS+=divide-to-integer\n \n cdsg: CFLAGS+=-pthread\n cdsg: LDFLAGS+=-pthread\n \n+# The following tests contain inline assembly that requires inlining,\n+# and thus cannot be built with -O0.\n rxsbg: CFLAGS+=-O2\n+divide-to-integer: CFLAGS+=-O2\n \n cgebra: LDFLAGS+=-lm\n clgebr: LDFLAGS+=-lm\n+divide-to-integer: LDFLAGS+=-lm\n \n include $(S390X_SRC)/pgm-specification.mak\n $(PGM_SPECIFICATION_TESTS): pgm-specification-user.o\ndiff --git a/tests/tcg/s390x/divide-to-integer.c b/tests/tcg/s390x/divide-to-integer.c\nnew file mode 100644\nindex 00000000000..62b4787ec0e\n--- /dev/null\n+++ b/tests/tcg/s390x/divide-to-integer.c\n@@ -0,0 +1,265 @@\n+/*\n+ * Test DIEBR and DIDBR instructions.\n+ *\n+ * Most inputs were discovered by fuzzing and exercise various corner cases in\n+ * the helpers.\n+ *\n+ * SPDX-License-Identifier: GPL-2.0-or-later\n+ */\n+#include <signal.h>\n+#include <stdio.h>\n+#include <stdlib.h>\n+#include <asm/ucontext.h>\n+\n+static void sigfpe_handler(int sig, siginfo_t *info, void *puc)\n+{\n+ struct ucontext *uc = puc;\n+ unsigned short *xr_insn;\n+ int r;\n+\n+ xr_insn = (unsigned short *)(uc->uc_mcontext.regs.psw.addr - 6);\n+ r = *xr_insn & 0xf;\n+ uc->uc_mcontext.regs.gprs[r] = sig;\n+}\n+\n+#define DIVIDE_TO_INTEGER(name, floatN) \\\n+static inline __attribute__((__always_inline__)) int \\\n+name(floatN *r1, floatN r2, floatN *r3, int m4, int *sig) \\\n+{ \\\n+ int cc; \\\n+ \\\n+ asm(/* Make the initial CC predictable for suppression tests */ \\\n+ \"xr %[sig],%[sig]\\n\" \\\n+ #name \" %[r1],%[r3],%[r2],%[m4]\\n\" \\\n+ \"ipm %[cc]\\n\" \\\n+ \"srl %[cc],28\" \\\n+ /* \\\n+ * Use earlyclobbers to prevent the compiler from reusing floating \\\n+ * point registers. This instruction doesn't like it. \\\n+ */ \\\n+ : [r1] \"+&f\" (*r1), [r3] \"+&f\" (*r3), [sig] \"=r\" (*sig), [cc] \"=d\" (cc)\\\n+ : [r2] \"f\" (r2), [m4] \"i\" (m4) \\\n+ : \"cc\"); \\\n+ \\\n+ return cc; \\\n+}\n+\n+DIVIDE_TO_INTEGER(diebr, float)\n+DIVIDE_TO_INTEGER(didbr, double)\n+\n+#define TEST_DIVIDE_TO_INTEGER(name, intN, int_fmt, floatN, float_fmt) \\\n+static inline __attribute__((__always_inline__)) int \\\n+test_ ## name(unsigned intN r1i, unsigned intN r2i, int m4, int fpc, \\\n+ unsigned intN r1o, unsigned intN r3o, int cco, unsigned int fpco,\\\n+ int sigo) \\\n+{ \\\n+ union { \\\n+ floatN f; \\\n+ unsigned intN i; \\\n+ } r1, r2, r3; \\\n+ int cc, err = 0, sig; \\\n+ \\\n+ r1.i = r1i; \\\n+ r2.i = r2i; \\\n+ r3.i = 0x12345678; \\\n+ printf(\"[ RUN ] %\" float_fmt \"(0x%\" int_fmt \\\n+ \") / %\" float_fmt \"(0x%\" int_fmt \")\\n\", r1.f, r1.i, r2.f, r2.i); \\\n+ asm volatile(\"sfpc %[fpc]\" : : [fpc] \"r\" (fpc)); \\\n+ cc = name(&r1.f, r2.f, &r3.f, m4, &sig); \\\n+ asm volatile(\"stfpc %[fpc]\" : [fpc] \"=Q\" (fpc)); \\\n+ if (r1.i != r1o) { \\\n+ printf(\"[ FAILED ] remainder 0x%\" int_fmt \\\n+ \" != expected 0x%\" int_fmt \"\\n\", r1.i, r1o); \\\n+ err += 1; \\\n+ } \\\n+ if (r3.i != r3o) { \\\n+ printf(\"[ FAILED ] quotient 0x%\" int_fmt \\\n+ \" != expected 0x%\" int_fmt \"\\n\", r3.i, r3o); \\\n+ err += 1; \\\n+ } \\\n+ if (cc != cco) { \\\n+ printf(\"[ FAILED ] cc %d != expected %d\\n\", cc, cco); \\\n+ err += 1; \\\n+ } \\\n+ if (fpc != fpco) { \\\n+ printf(\"[ FAILED ] fpc 0x%x != expected 0x%x\\n\", fpc, fpco); \\\n+ err += 1; \\\n+ } \\\n+ if (sig != sigo) { \\\n+ printf(\"[ FAILED ] signal 0x%x != expected 0x%x\\n\", sig, sigo); \\\n+ err += 1; \\\n+ } \\\n+ \\\n+ return err; \\\n+}\n+\n+TEST_DIVIDE_TO_INTEGER(diebr, int, \"x\", float, \"f\")\n+TEST_DIVIDE_TO_INTEGER(didbr, long, \"lx\", double, \"lf\")\n+\n+int main(void)\n+{\n+ struct sigaction act = {\n+ .sa_sigaction = sigfpe_handler,\n+ .sa_flags = SA_SIGINFO,\n+ };\n+ int err = 0;\n+\n+ /* Set up SIG handler */\n+ if (sigaction(SIGFPE, &act, NULL)) {\n+ printf(\"[ FAILED ] sigaction(SIGFPE) failed\\n\");\n+ return EXIT_FAILURE;\n+ }\n+\n+ /* 451 / 460 */\n+ err += test_diebr(0x43e1f1f1, 0x43e61616, 7, 0,\n+ 0x43e1f1f1, 0, 0, 0, 0);\n+\n+ /* 480 / 0 */\n+ err += test_diebr(0x43f00000, 0, 0, 0,\n+ 0x7fc00000, 0x7fc00000, 1, 0x800000, 0);\n+\n+ /* QNaN / QNaN */\n+ err += test_diebr(0xffffffff, 0xffffffff, 0, 0,\n+ 0xffffffff, 0xffffffff, 1, 0, 0);\n+\n+ /* -2.08E-8 / -2.08E-8 */\n+ err += test_diebr(0xb2b2b2b2, 0xb2b2b2b2, 0, 0,\n+ 0x80000000, 0x3f800000, 0, 0, 0);\n+\n+ /*\n+ * Test partial remainder without quotient scaling (cc2).\n+ *\n+ * a = 12401981 / 268435456\n+ * b = -5723991 / 72057594037927936\n+ * q = a / b = -3329131425038336 / 5723991 =~ -581610178.1\n+ * n = round(q, float32, nearest_even) = -581610176\n+ * r_precise = a - b * n = 189155 / 1125899906842624\n+ * r = round(r_precise, float32, nearest_even) = r_precise\n+ */\n+ err += test_diebr(0x3d3d3d3d, 0xaeaeaeae, 0, 0,\n+ 0x2f38b8c0, 0xce0aaaab, 2, 0, 0);\n+\n+ /* 1.07E-31 / 2.19 */\n+ err += test_diebr(0x0c0c0c0c, 0x400c0c0c, 6, 0,\n+ 0xc00c0c0c, 0x3f800000, 0, 0x80000, 0);\n+\n+ /*\n+ * Test partial remainder with quotient scaling (cc3).\n+ *\n+ * a = 298343530578310714772108083200\n+ * b = -592137/10384593717069655257060992658440192\n+ * q = a / b\n+ * = -1032725451057301340137043014721780674141077289604872315653324800 /\n+ * 197379\n+ * =~ -5232195173029052432817285601415452880707052369324357280426.6\n+ * n = round(q, float32, nearest_even)\n+ * = -5232194943010009439437691768433469154159343131709361094656\n+ * n / 2^192 = -6992213 / 8388608\n+ * r_precise = a - b * n = 13115851209189604982784\n+ * r = round(r_precise, float32, nearest_even) = r_precise\n+ */\n+ err += test_diebr(0x7070ffff, 0x90909090, 0, 0,\n+ 0x6431c0c0, 0xbf5562aa, 3, 0, 0);\n+\n+ /*\n+ * Test large, but representable quotient.\n+ *\n+ * a = -12040119 / 549755813888\n+ * b = 1 / 38685626227668133590597632\n+ * q = a / b = -847248053779631702016\n+ * n = round(q, float32, to_odd) = q\n+ * r_precise = a - b * n = -0\n+ * r = round(r_precise, float32, nearest_even) = -0\n+ */\n+ err += test_diebr(0xb7b7b7b7, 0x15000000, 7, 0,\n+ 0x80000000, 0xe237b7b7, 0, 0, 0);\n+\n+ /* 0 / 0 */\n+ err += test_diebr(0, 0, 1, 0,\n+ 0x7fc00000, 0x7fc00000, 1, 0x800000, 0);\n+\n+ /* 4.3E-33 / -2.08E-8 with SIGFPE */\n+ err += test_diebr(0x09b2b2b2, 0xb2b2b2b2, 0, 0xfc000007,\n+ 0xb2b2b2b1, 0xbf800000, 0, 0xfc000807, SIGFPE);\n+\n+ /*\n+ * Test tiny remainder scaling when FPC Underflow Mask is set.\n+ *\n+ * 1.19E-39 / -1.28E-9 = { r = 1.19E-39 * 2^192, n = -0 }\n+ */\n+ err += test_diebr(0x000d0100, 0xb0b0b0b0, 6, 0xfc000000,\n+ 0x5ed01000, 0x80000000, 0, 0xfc001000, SIGFPE);\n+\n+ /*\n+ * Test \"inexact and incremented\" DXC.\n+ *\n+ * a = 53555504\n+ * b = -520849213389117849600\n+ * q = a / b = -3347219 / 32553075836819865600\n+ * n = round(q, float32, to_odd) = -1\n+ * r_precise = a - b * n = -520849213389064294096\n+ * r = round(r_precise, float32, to_odd) = -520849213389117849600\n+ * abs(r) - abs(r_precise) = 53555504\n+ */\n+ err += test_diebr(0x4c4c4c4c, 0xe1e1e1e1, 0, 0xfc000007,\n+ 0xe1e1e1e1, 0xbf800000, 0, 0xfc000c07, SIGFPE);\n+\n+ /* 0 / 0 with SIGFPE */\n+ err += test_diebr(0, 0, 0, 0xfc000007,\n+ 0, 0x12345678, 0, 0xfc008007, SIGFPE);\n+\n+ /* 5.76E-16 / 5.39E+34 */\n+ err += test_diebr(0x26262626, 0x79262626, 6, 0,\n+ 0xf9262626, 0x3f800000, 0, 0x80000, 0);\n+\n+ /* -4.97E+17 / 2.03E-38 */\n+ err += test_diebr(0xdcdcdcdc, 0x00dcdcdc, 7, 0xfc000000,\n+ 0x80000000, 0xbb800000, 1, 0xfc000000, 0);\n+\n+ /* -1.23E+17 / SNaN */\n+ err += test_diebr(0xdbdb240b, 0xffac73ff, 4, 0,\n+ 0xffec73ff, 0xffec73ff, 1, 0x800000, 0);\n+\n+ /* 2.34E-38 / 3.27E-33 with SIGFPE */\n+ err += test_diebr(0x00ff0987, 0x0987c6f6, 6, 0x08000000,\n+ 0x8987c6b6, 0x3f800000, 0, 0x8000800, SIGFPE);\n+\n+ /* -5.93E+11 / -2.7E+4 */\n+ err += test_diebr(0xd30a0040, 0xc6d30a00, 0, 0xc4000000,\n+ 0xc74a4400, 0x4ba766c6, 2, 0xc4000000, 0);\n+\n+ /* 9.86E-32 / -inf */\n+ err += test_diebr(0x0c000029, 0xff800000, 0, 0,\n+ 0xc000029, 0x80000000, 0, 0, 0);\n+\n+ /* QNaN / SNaN */\n+ err += test_diebr(0xffff94ff, 0xff94ff24, 4, 7,\n+ 0xffd4ff24, 0xffd4ff24, 1, 0x800007, 0);\n+\n+ /* 2.8E-43 / -inf */\n+ err += test_diebr(0x000000c8, 0xff800000, 0, 0x7c000007,\n+ 0x000000c8, 0x80000000, 0, 0x7c000007, 0);\n+\n+ /* -1.7E+38 / -inf */\n+ err += test_diebr(0xff00003d, 0xff800000, 0, 0,\n+ 0xff00003d, 0, 0, 0, 0);\n+\n+ /* 1.94E-304 / 1.94E-304 */\n+ err += test_didbr(0x00e100e100e100e1, 0x00e100e100e100e1, 0, 1,\n+ 0, 0x3ff0000000000000, 0, 1, 0);\n+\n+ /* 4.82E-299 / 5.29E-308 */\n+ err += test_didbr(0x0200230200230200, 0x0023020023020023, 0, 0,\n+ 0x8001a017d247b3f4, 0x41cb2aa05f000000, 0, 0, 0);\n+\n+ /* -1.38E-75 / -3.77E+208 */\n+ err += test_didbr(0xb063eb3d63b063eb, 0xeb3d63b063eb3d63, 3, 0xe8000000,\n+ 0x6b3d63b063eb3d63, 0x3ff0000000000000, 0, 0xe8000c00,\n+ SIGFPE);\n+\n+ /* 4.78E-299 / 6.88E-315 */\n+ err += test_didbr(0x0200000000000000, 0x0000000053020000, 0, 0,\n+ 0x8000000020820000, 0x4338ac20dd47c6c1, 0, 0, 0);\n+\n+ return err ? EXIT_FAILURE : EXIT_SUCCESS;\n+}\n", "prefixes": [ "v5", "5/5" ] }