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+instruction: 0.788
+runtime: 0.124
+syscall: 0.088
+
+
+
+Assertion failure when executing RISC-V vfncvt.rtz.x.f.w instruction
+Description of problem:
+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
+Steps to 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 information:
+