ci: Clean up no_atomic.sh

ci/no_atomic.sh

@@ -8,45 +8,24 @@ cd "$(dirname "$0")"/..
 # Usage:
 #    ./ci/no_atomic.sh
 
-file="no_atomic.rs"
+file=no_atomic.rs
 
-no_atomic=()
-for target_spec in $(RUSTC_BOOTSTRAP=1 rustc +stable -Z unstable-options --print all-target-specs-json | jq -c '. | to_entries | .[]'); do
-    target=$(jq <<<"${target_spec}" -r '.key')
-    target_spec=$(jq <<<"${target_spec}" -c '.value')
-    res=$(jq <<<"${target_spec}" -r 'select(."atomic-cas" == false)')
-    [[ -z "${res}" ]] || no_atomic_cas+=("${target}")
-    max_atomic_width=$(jq <<<"${target_spec}" -r '."max-atomic-width"')
-    min_atomic_width=$(jq <<<"${target_spec}" -r '."min-atomic-width"')
-    case "${max_atomic_width}" in
-        # `"max-atomic-width" == 0` means that atomic is not supported at all.
-        # We do not have a cfg for targets with {8,16}-bit atomic only, so
-        # for now we treat them the same as targets that do not support atomic.
-        0) no_atomic+=("${target}") ;;
-        # It is not clear exactly what `"max-atomic-width" == null` means, but they
-        # actually seem to have the same max-atomic-width as the target-pointer-width.
-        # The targets currently included in this group are "mipsel-sony-psp",
-        # "thumbv4t-none-eabi", "thumbv6m-none-eabi", all of which are
-        # `"target-pointer-width" == "32"`, so assuming them `"max-atomic-width" == 32`
-        # for now.
-        null | 8 | 16 | 32 | 64 | 128) ;;
-        *) exit 1 ;;
-    esac
-    case "${min_atomic_width}" in
-        8 | null)  ;;
-        *) no_atomic+=("${target}") ;;
-    esac
-done
+# `"max-atomic-width" == 0` means that atomic is not supported at all.
+# We do not have a cfg for targets with {8,16}-bit atomic only, so
+# for now we treat them the same as targets that do not support atomic.
+# It is not clear exactly what `"max-atomic-width" == null` means, but they
+# actually seem to have the same max-atomic-width as the target-pointer-width.
+# The targets currently included in this group are "mipsel-sony-psp",
+# "thumbv4t-none-eabi", "thumbv6m-none-eabi", all of which are
+# `"target-pointer-width" == "32"`, so assuming them `"max-atomic-width" == 32`
+# for now.
+no_atomic=$(RUSTC_BOOTSTRAP=1 rustc +stable -Z unstable-options --print all-target-specs-json | jq -r '. | to_entries[] | select((.value."max-atomic-width" == 0) or (.value."min-atomic-width" and .value."min-atomic-width" != 8)) | "    \"" + .key + "\","')
 
 cat >"${file}" <<EOF
-// This file is @generated by $(basename "$0").
+// This file is @generated by ${0##*/}.
 // It is not intended for manual editing.
 
 const NO_ATOMIC: &[&str] = &[
-EOF
-for target in "${no_atomic[@]}"; do
-    echo "    \"${target}\"," >>"${file}"
-done
-cat >>"${file}" <<EOF
+${no_atomic}
 ];
 EOF