rustup: disable float non-det in portable-simd

Author: RalfJung

ci-test.sh

@@ -86,7 +86,8 @@ simd)
         cargo miri test --lib --tests -- --skip ptr \
         2>&1 | ts -i '%.s  '
     # This contains some pointer tests that do int/ptr casts, so we need permissive provenance.
-    MIRIFLAGS="$DEFAULTFLAGS -Zmiri-permissive-provenance" \
+    # FIXME: disabling float non-determinism due to <https://github.com/rust-lang/portable-simd/issues/463>.
+    MIRIFLAGS="$DEFAULTFLAGS -Zmiri-permissive-provenance -Zmiri-deterministic-floats" \
         cargo miri test --lib --tests -- ptr \
         2>&1 | ts -i '%.s  '
     echo "::endgroup::"

rust-version

@@ -1 +1 @@
-nightly-2025-06-09
+nightly-2025-06-14