1 files changed, 0 insertions, 69 deletions
diff --git a/gitlab/issues_text/target_riscv/host_missing/accel_missing/2422 b/gitlab/issues_text/target_riscv/host_missing/accel_missing/2422
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--- a/gitlab/issues_text/target_riscv/host_missing/accel_missing/2422
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@@ -1,69 +0,0 @@
-`vill` not set after reserved `vsetvli` instruction usage
-Description of problem:
-The ["AVL encoding" section of the RISC-V V Spec 1.0](https://github.com/riscv/riscv-isa-manual/blob/main/src/v-st-ext.adoc#avl-encoding) states that a `vsetvli  x0,x0,...` that changes VLMAX is reserved and "Implementations may set `vill`" in this case. QEMU does not set `vill` in this case. Doing so would help detect code generation issues and non-portable code.
-
-Here is the quote from the spec:
-
-> When `rs1=x0` and `rd=x0`, the instruction operates as if the current
-> vector length in `vl` is used as the AVL, and the resulting value is
-> written to `vl`, but not to a destination register.  This form can
-> only be used when VLMAX and hence `vl` is not actually changed by the
-> new SEW/LMUL ratio.  Use of the instruction with a new SEW/LMUL ratio
-> that would result in a change of VLMAX is reserved.
-> Use of the instruction is also reserved if `vill` was 1 beforehand.
-> Implementations may set `vill` in either case.
-
-Note, I have not checked QEMU's behaviour for the other case mentioned in the quote: "Use of the instruction is also reserved if `vill` was 1 beforehand".
-Steps to reproduce:
-1. Create `test.c`
-```C
-#include <assert.h>
-
-/* Position of vill in vtype.  */
-
-#define VILL_BIT (__riscv_xlen - 1)
-
-/* Return true if vill is 1.  */
-
-int vill_set_p ()
-{
-  __UINT64_TYPE__ vtype;
-  asm volatile ("csrr %0, vtype" : "=r"(vtype));
-
-  return (vtype >> VILL_BIT) & 1;
-}
-
-/* Return true if vill is 0.  */
-
-int vill_clear_p ()
-{
-  return !vill_set_p ();
-}
-
-int main ()
-{
-  int vl;
-
-  assert (vill_clear_p ());
-
-  /* Valid: vl = VLMAX.  */
-  asm volatile ("vsetvli %0,zero,e64,m8,ta,ma\n" : "=r"(vl));
-  assert (vill_clear_p ());
-
-  /* Valid: vl and VLMAX not changed.  */
-  asm volatile ("vsetvli zero,zero,e64,m8,ta,ma\n");
-  assert (vill_clear_p ());
-
-  /* Reserved: Reduce VLMAX.  */
-  asm volatile ("vsetvli zero,zero,e64,m1,ta,ma\n");
-  assert (vill_set_p ());
-
-  return 0;
-}
-```
-2. Build `test.c` with `riscv32-unknown-elf-gcc test.c -o test -march=rv64gcv -mabi=lp64d`
-3. Run qemu with `qemu-riscv64 -cpu rv64,v=true test`
-4. The final assertion fails because executing the reserved `vsetvli` did not set `vill`
-```
-assertion "vill_set_p ()" failed: file "test.c", line 40, function: main
-```