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-id = 1441
-title = "Assertion failure when executing RISC-V vfncvt.rtz.x.f.w instruction"
-state = "closed"
-created_at = "2023-01-13T22:10:02.691Z"
-closed_at = "2023-01-17T17:39:50.962Z"
-labels = ["Closed::Duplicate", "accel: TCG", "target: riscv"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/1441"
-host-os = "RHEL 8.6"
-host-arch = "x86"
-qemu-version = "7.2.50"
-guest-os = "n/a"
-guest-arch = "RISC-V"
-description = """When emulating the `vfncvt.rtz.x.f.w` instruction, QEMU crashes with an assertion failure at `target/riscv/translate.c:211`, complaining that ```decode_save_opc: Assertion `ctx->insn_start != NULL' failed.```
-
-It appears this problem first emerged with https://gitlab.com/qemu-project/qemu/-/commit/a9814e3e08d2aacbd9018c36c77c2fb652537848"""
-reproduce = """The following C program triggers the assertion failure when built a sufficiently recent version of the Clang cross compiler (in my case 15.0.6):
-```
-/* test.c */
-#include <riscv_vector.h>
-
-#define LEN 4
-
-int main(int argc, char *argv[]) {
-  double in[LEN];
-  int out[LEN];
-
-  vfloat64m1_t vf = vle64_v_f64m1(in, LEN);
-  vint32mf2_t vi = vfncvt_rtz_x_f_w_i32mf2(vf, LEN);
-  vse32_v_i32mf2(out, vi, LEN);
-
-  return 0;
-}
-```
-
-The above `test.c` can be compiled and run as follows:
-```
-clang -O3 -march=rv64gcv -static test.c
-qemu-riscv64 -cpu "rv64,zba=true,zbb=true,zbc=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0" a.out
-qemu-riscv64: ../target/riscv/translate.c:211: decode_save_opc: Assertion `ctx->insn_start != NULL' failed.
-Segmentation fault (core dumped)
-```"""
-additional = """"""