Auto merge of #150848 - cuviper:beta-next, r=cuviper

rust-bors[bot] · web-flow · commit 7bea8c6cf1cc · 2026-01-09T18:52:14.000Z
[beta] backports - Revert "Rollup merge of #149147 - chenyukang:yukang-fix-unused_assignments-macro-gen-147648, r=JonathanBrouwer" #149657 - Don't lint on interior mutable `const` item coming from derefs #150166 - stdarch subtree update #150639 (partial) - Update bors configuration #150308 - Update bors e-mail lookup #150783 - Make verify-channel.sh script compatible with new bors #150759 r? cuviper
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -15,6 +15,7 @@ on:
       - try
       - try-perf
       - automation/bors/try
+      - automation/bors/auto
   pull_request:
     branches:
       - "**"
@@ -56,7 +57,7 @@ jobs:
       - name: Test citool
         # Only test citool on the auto branch, to reduce latency of the calculate matrix job
         # on PR/try builds.
-        if: ${{ github.ref == 'refs/heads/auto' }}
+        if: ${{ github.ref == 'refs/heads/auto' || github.ref == 'refs/heads/automation/bors/auto' }}
         run: |
           cd src/ci/citool
           CARGO_INCREMENTAL=0 cargo test
@@ -79,7 +80,7 @@ jobs:
     # access the environment.
     #
     # We only enable the environment for the rust-lang/rust repository, so that CI works on forks.
-    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/auto')) && 'bors') || '' }}
+    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/auto' || github.ref == 'refs/heads/automation/bors/auto')) && 'bors') || '' }}
     env:
       CI_JOB_NAME: ${{ matrix.name }}
       CI_JOB_DOC_URL: ${{ matrix.doc_url }}
@@ -313,7 +314,7 @@ jobs:
     needs: [ calculate_matrix, job ]
     # !cancelled() executes the job regardless of whether the previous jobs passed or failed
     if: ${{ !cancelled() && contains(fromJSON('["auto", "try"]'), needs.calculate_matrix.outputs.run_type) }}
-    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/auto')) && 'bors') || '' }}
+    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/auto' || github.ref == 'refs/heads/automation/bors/auto')) && 'bors') || '' }}
     steps:
       - name: checkout the source code
         uses: actions/checkout@v5
diff --git a/.github/workflows/post-merge.yml b/.github/workflows/post-merge.yml
@@ -29,7 +29,7 @@ jobs:
           sleep 60
 
           # Get closest bors merge commit
-          PARENT_COMMIT=`git rev-list --author='bors <bors@rust-lang.org>' -n1 --first-parent HEAD^1`
+          PARENT_COMMIT=`git rev-list --author='122020455+rust-bors\[bot\]@users.noreply.github.com' -n1 --first-parent HEAD^1`
           echo "Parent: ${PARENT_COMMIT}"
 
           # Find PR for the current commit
diff --git a/compiler/rustc_lint/src/interior_mutable_consts.rs b/compiler/rustc_lint/src/interior_mutable_consts.rs
@@ -1,6 +1,7 @@
 use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{Expr, ExprKind, ItemKind, Node, find_attr};
+use rustc_middle::ty::adjustment::Adjust;
 use rustc_session::{declare_lint, declare_lint_pass};
 
 use crate::lints::{ConstItemInteriorMutationsDiag, ConstItemInteriorMutationsSuggestionStatic};
@@ -77,6 +78,13 @@ impl<'tcx> LateLintPass<'tcx> for InteriorMutableConsts {
         if let ExprKind::Path(qpath) = &receiver.kind
             && let Res::Def(DefKind::Const | DefKind::AssocConst, const_did) =
                 typeck.qpath_res(qpath, receiver.hir_id)
+            // Don't consider derefs as those can do arbitrary things
+            // like using thread local (see rust-lang/rust#150157)
+            && !cx
+                .typeck_results()
+                .expr_adjustments(receiver)
+                .into_iter()
+                .any(|adj| matches!(adj.kind, Adjust::Deref(_)))
             // Let's do the attribute check after the other checks for perf reasons
             && find_attr!(
                 cx.tcx.get_all_attrs(method_did),
diff --git a/compiler/rustc_mir_transform/src/liveness.rs b/compiler/rustc_mir_transform/src/liveness.rs
@@ -75,11 +75,6 @@ pub(crate) fn check_liveness<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Den
         return DenseBitSet::new_empty(0);
     }
 
-    // Don't run unused pass for items generated by foreign macros
-    if tcx.def_span(parent).in_external_macro(tcx.sess.source_map()) {
-        return DenseBitSet::new_empty(0);
-    }
-
     let mut body = &*tcx.mir_promoted(def_id).0.borrow();
     let mut body_mem;
 
diff --git a/library/stdarch/crates/core_arch/src/x86/avx2.rs b/library/stdarch/crates/core_arch/src/x86/avx2.rs
@@ -1754,12 +1754,19 @@ pub fn _mm256_inserti128_si256<const IMM1: i32>(a: __m256i, b: __m128i) -> __m25
 #[cfg_attr(test, assert_instr(vpmaddwd))]
 #[stable(feature = "simd_x86", since = "1.27.0")]
 pub fn _mm256_madd_epi16(a: __m256i, b: __m256i) -> __m256i {
-    unsafe {
-        let r: i32x16 = simd_mul(simd_cast(a.as_i16x16()), simd_cast(b.as_i16x16()));
-        let even: i32x8 = simd_shuffle!(r, r, [0, 2, 4, 6, 8, 10, 12, 14]);
-        let odd: i32x8 = simd_shuffle!(r, r, [1, 3, 5, 7, 9, 11, 13, 15]);
-        simd_add(even, odd).as_m256i()
-    }
+    // It's a trick used in the Adler-32 algorithm to perform a widening addition.
+    //
+    // ```rust
+    // #[target_feature(enable = "avx2")]
+    // unsafe fn widening_add(mad: __m256i) -> __m256i {
+    //     _mm256_madd_epi16(mad, _mm256_set1_epi16(1))
+    // }
+    // ```
+    //
+    // If we implement this using generic vector intrinsics, the optimizer
+    // will eliminate this pattern, and `vpmaddwd` will no longer be emitted.
+    // For this reason, we use x86 intrinsics.
+    unsafe { transmute(pmaddwd(a.as_i16x16(), b.as_i16x16())) }
 }
 
 /// Vertically multiplies each unsigned 8-bit integer from `a` with the
@@ -3701,6 +3708,8 @@ unsafe extern "C" {
     fn phaddsw(a: i16x16, b: i16x16) -> i16x16;
     #[link_name = "llvm.x86.avx2.phsub.sw"]
     fn phsubsw(a: i16x16, b: i16x16) -> i16x16;
+    #[link_name = "llvm.x86.avx2.pmadd.wd"]
+    fn pmaddwd(a: i16x16, b: i16x16) -> i32x8;
     #[link_name = "llvm.x86.avx2.pmadd.ub.sw"]
     fn pmaddubsw(a: u8x32, b: i8x32) -> i16x16;
     #[link_name = "llvm.x86.avx2.mpsadbw"]
diff --git a/library/stdarch/crates/core_arch/src/x86/avx512bw.rs b/library/stdarch/crates/core_arch/src/x86/avx512bw.rs
@@ -5847,20 +5847,19 @@ pub unsafe fn _mm_mask_storeu_epi8(mem_addr: *mut i8, mask: __mmask16, a: __m128
 #[stable(feature = "stdarch_x86_avx512", since = "1.89")]
 #[cfg_attr(test, assert_instr(vpmaddwd))]
 pub fn _mm512_madd_epi16(a: __m512i, b: __m512i) -> __m512i {
-    unsafe {
-        let r: i32x32 = simd_mul(simd_cast(a.as_i16x32()), simd_cast(b.as_i16x32()));
-        let even: i32x16 = simd_shuffle!(
-            r,
-            r,
-            [0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30]
-        );
-        let odd: i32x16 = simd_shuffle!(
-            r,
-            r,
-            [1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31]
-        );
-        simd_add(even, odd).as_m512i()
-    }
+    // It's a trick used in the Adler-32 algorithm to perform a widening addition.
+    //
+    // ```rust
+    // #[target_feature(enable = "avx512bw")]
+    // unsafe fn widening_add(mad: __m512i) -> __m512i {
+    //     _mm512_madd_epi16(mad, _mm512_set1_epi16(1))
+    // }
+    // ```
+    //
+    // If we implement this using generic vector intrinsics, the optimizer
+    // will eliminate this pattern, and `vpmaddwd` will no longer be emitted.
+    // For this reason, we use x86 intrinsics.
+    unsafe { transmute(vpmaddwd(a.as_i16x32(), b.as_i16x32())) }
 }
 
 /// Multiply packed signed 16-bit integers in a and b, producing intermediate signed 32-bit integers. Horizontally add adjacent pairs of intermediate 32-bit integers, and pack the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).
@@ -11687,6 +11686,8 @@ unsafe extern "C" {
     #[link_name = "llvm.x86.avx512.pmul.hr.sw.512"]
     fn vpmulhrsw(a: i16x32, b: i16x32) -> i16x32;
 
+    #[link_name = "llvm.x86.avx512.pmaddw.d.512"]
+    fn vpmaddwd(a: i16x32, b: i16x32) -> i32x16;
     #[link_name = "llvm.x86.avx512.pmaddubs.w.512"]
     fn vpmaddubsw(a: u8x64, b: i8x64) -> i16x32;
 
diff --git a/library/stdarch/crates/core_arch/src/x86/sse2.rs b/library/stdarch/crates/core_arch/src/x86/sse2.rs
@@ -201,12 +201,19 @@ pub fn _mm_avg_epu16(a: __m128i, b: __m128i) -> __m128i {
 #[cfg_attr(test, assert_instr(pmaddwd))]
 #[stable(feature = "simd_x86", since = "1.27.0")]
 pub fn _mm_madd_epi16(a: __m128i, b: __m128i) -> __m128i {
-    unsafe {
-        let r: i32x8 = simd_mul(simd_cast(a.as_i16x8()), simd_cast(b.as_i16x8()));
-        let even: i32x4 = simd_shuffle!(r, r, [0, 2, 4, 6]);
-        let odd: i32x4 = simd_shuffle!(r, r, [1, 3, 5, 7]);
-        simd_add(even, odd).as_m128i()
-    }
+    // It's a trick used in the Adler-32 algorithm to perform a widening addition.
+    //
+    // ```rust
+    // #[target_feature(enable = "sse2")]
+    // unsafe fn widening_add(mad: __m128i) -> __m128i {
+    //     _mm_madd_epi16(mad, _mm_set1_epi16(1))
+    // }
+    // ```
+    //
+    // If we implement this using generic vector intrinsics, the optimizer
+    // will eliminate this pattern, and `pmaddwd` will no longer be emitted.
+    // For this reason, we use x86 intrinsics.
+    unsafe { transmute(pmaddwd(a.as_i16x8(), b.as_i16x8())) }
 }
 
 /// Compares packed 16-bit integers in `a` and `b`, and returns the packed
@@ -3054,6 +3061,8 @@ unsafe extern "C" {
     fn lfence();
     #[link_name = "llvm.x86.sse2.mfence"]
     fn mfence();
+    #[link_name = "llvm.x86.sse2.pmadd.wd"]
+    fn pmaddwd(a: i16x8, b: i16x8) -> i32x4;
     #[link_name = "llvm.x86.sse2.psad.bw"]
     fn psadbw(a: u8x16, b: u8x16) -> u64x2;
     #[link_name = "llvm.x86.sse2.psll.w"]
diff --git a/rust-bors.toml b/rust-bors.toml
@@ -25,3 +25,42 @@ labels_blocking_approval = [
     "S-waiting-on-t-rustdoc-frontend",
     "S-waiting-on-t-clippy"
 ]
+
+# If CI runs quicker than this duration, consider it to be a failure
+min_ci_time = 600
+
+[labels]
+approved = [
+    "+S-waiting-on-bors",
+    "-S-blocked",
+    "-S-waiting-on-author",
+    "-S-waiting-on-crater",
+    "-S-waiting-on-review",
+    "-S-waiting-on-team"
+]
+unapproved = [
+    "+S-waiting-on-author",
+    "-S-blocked",
+    "-S-waiting-on-bors",
+    "-S-waiting-on-crater",
+    "-S-waiting-on-review",
+    "-S-waiting-on-team"
+]
+try_failed = [
+    "+S-waiting-on-author",
+    "-S-waiting-on-review",
+    "-S-waiting-on-crater"
+]
+auto_build_succeeded = ["+merged-by-bors"]
+auto_build_failed = [
+    "+S-waiting-on-review",
+    "-S-blocked",
+    "-S-waiting-on-bors",
+    "-S-waiting-on-author",
+    "-S-waiting-on-crater",
+    "-S-waiting-on-team"
+]
+
+# Flip this two once new bors is used for actual merges on this repository
+merge_queue_enabled = false
+report_merge_conflicts = true
diff --git a/src/build_helper/src/git.rs b/src/build_helper/src/git.rs
@@ -152,6 +152,14 @@ pub fn has_changed_since(git_dir: &Path, base: &str, paths: &[&str]) -> bool {
     })
 }
 
+const LEGACY_BORS_EMAIL: &str = "bors@rust-lang.org";
+
+/// Escape characters from the git user e-mail, so that git commands do not interpret it as regex
+/// special characters.
+fn escape_email_git_regex(text: &str) -> String {
+    text.replace("[", "\\[").replace("]", "\\]").replace(".", "\\.")
+}
+
 /// Returns the latest upstream commit that modified `target_paths`, or `None` if no such commit
 /// was found.
 fn get_latest_upstream_commit_that_modified_files(
@@ -182,9 +190,15 @@ fn get_latest_upstream_commit_that_modified_files(
         "-n1",
         &upstream,
         "--author",
-        git_config.git_merge_commit_email,
+        &escape_email_git_regex(git_config.git_merge_commit_email),
     ]);
 
+    // Also search for legacy bors account, before we accrue enough commits to
+    // have changes to all relevant file paths done by new bors.
+    if git_config.git_merge_commit_email != LEGACY_BORS_EMAIL {
+        git.args(["--author", LEGACY_BORS_EMAIL]);
+    }
+
     if !target_paths.is_empty() {
         git.arg("--").args(target_paths);
     }
@@ -229,11 +243,17 @@ pub fn get_closest_upstream_commit(
     git.args([
         "rev-list",
         "--author-date-order",
-        &format!("--author={}", config.git_merge_commit_email),
+        &format!("--author={}", &escape_email_git_regex(config.git_merge_commit_email),),
         "-n1",
         base,
     ]);
 
+    // Also search for legacy bors account, before we accrue enough commits to
+    // have changes to all relevant file paths done by new bors.
+    if config.git_merge_commit_email != LEGACY_BORS_EMAIL {
+        git.args(["--author", LEGACY_BORS_EMAIL]);
+    }
+
     let output = output_result(&mut git)?.trim().to_owned();
     if output.is_empty() { Ok(None) } else { Ok(Some(output)) }
 }
diff --git a/src/ci/citool/src/main.rs b/src/ci/citool/src/main.rs
@@ -46,7 +46,9 @@ impl GitHubContext {
                 let patterns = if !patterns.is_empty() { Some(patterns) } else { None };
                 Some(RunType::TryJob { job_patterns: patterns })
             }
-            ("push", "refs/heads/auto") => Some(RunType::AutoJob),
+            ("push", "refs/heads/auto" | "refs/heads/automation/bors/auto") => {
+                Some(RunType::AutoJob)
+            }
             ("push", "refs/heads/main") => Some(RunType::MainJob),
             _ => None,
         }
diff --git a/src/ci/docker/run.sh b/src/ci/docker/run.sh
@@ -312,16 +312,6 @@ else
   command=(/checkout/src/ci/run.sh)
 fi
 
-if isCI; then
-  # Get some needed information for $BASE_COMMIT
-  #
-  # This command gets the last merge commit which we'll use as base to list
-  # deleted files since then.
-  BASE_COMMIT="$(git log --author=bors@rust-lang.org -n 2 --pretty=format:%H | tail -n 1)"
-else
-  BASE_COMMIT=""
-fi
-
 SUMMARY_FILE=github-summary.md
 touch $objdir/${SUMMARY_FILE}
 
@@ -359,7 +349,6 @@ docker \
   --env RUST_CI_OVERRIDE_RELEASE_CHANNEL \
   --env CI_JOB_NAME="${CI_JOB_NAME-$image}" \
   --env CI_JOB_DOC_URL="${CI_JOB_DOC_URL}" \
-  --env BASE_COMMIT="$BASE_COMMIT" \
   --env DIST_TRY_BUILD \
   --env PR_CI_JOB \
   --env OBJDIR_ON_HOST="$objdir" \
diff --git a/src/ci/scripts/verify-channel.sh b/src/ci/scripts/verify-channel.sh
@@ -8,7 +8,8 @@ IFS=$'\n\t'
 
 source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 
-if isCiBranch auto || isCiBranch try || isCiBranch try-perf || isCiBranch automation/bors/try; then
+if isCiBranch auto || isCiBranch try || isCiBranch try-perf || \
+   isCiBranch automation/bors/try || isCiBranch automation/bors/auto; then
     echo "channel verification is only executed on PR builds"
     exit
 fi
diff --git a/src/stage0 b/src/stage0
@@ -1,7 +1,7 @@
 dist_server=https://static.rust-lang.org
 artifacts_server=https://ci-artifacts.rust-lang.org/rustc-builds
 artifacts_with_llvm_assertions_server=https://ci-artifacts.rust-lang.org/rustc-builds-alt
-git_merge_commit_email=bors@rust-lang.org
+git_merge_commit_email=122020455+rust-bors[bot]@users.noreply.github.com
 nightly_branch=main
 
 # The configuration above this comment is editable, and can be changed
diff --git a/src/tools/miri/src/shims/x86/avx2.rs b/src/tools/miri/src/shims/x86/avx2.rs
@@ -245,6 +245,42 @@ pub(super) trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
                 shift_simd_by_scalar(this, left, right, which, dest)?;
             }
+            // Used to implement the _mm256_madd_epi16 function.
+            // Multiplies packed signed 16-bit integers in `left` and `right`, producing
+            // intermediate signed 32-bit integers. Horizontally add adjacent pairs of
+            // intermediate 32-bit integers, and pack the results in `dest`.
+            "pmadd.wd" => {
+                let [left, right] =
+                    this.check_shim_sig_lenient(abi, CanonAbi::C, link_name, args)?;
+
+                let (left, left_len) = this.project_to_simd(left)?;
+                let (right, right_len) = this.project_to_simd(right)?;
+                let (dest, dest_len) = this.project_to_simd(dest)?;
+
+                assert_eq!(left_len, right_len);
+                assert_eq!(dest_len.strict_mul(2), left_len);
+
+                for i in 0..dest_len {
+                    let j1 = i.strict_mul(2);
+                    let left1 = this.read_scalar(&this.project_index(&left, j1)?)?.to_i16()?;
+                    let right1 = this.read_scalar(&this.project_index(&right, j1)?)?.to_i16()?;
+
+                    let j2 = j1.strict_add(1);
+                    let left2 = this.read_scalar(&this.project_index(&left, j2)?)?.to_i16()?;
+                    let right2 = this.read_scalar(&this.project_index(&right, j2)?)?.to_i16()?;
+
+                    let dest = this.project_index(&dest, i)?;
+
+                    // Multiplications are i16*i16->i32, which will not overflow.
+                    let mul1 = i32::from(left1).strict_mul(right1.into());
+                    let mul2 = i32::from(left2).strict_mul(right2.into());
+                    // However, this addition can overflow in the most extreme case
+                    // (-0x8000)*(-0x8000)+(-0x8000)*(-0x8000) = 0x80000000
+                    let res = mul1.wrapping_add(mul2);
+
+                    this.write_scalar(Scalar::from_i32(res), &dest)?;
+                }
+            }
             _ => return interp_ok(EmulateItemResult::NotSupported),
         }
         interp_ok(EmulateItemResult::NeedsReturn)
diff --git a/src/tools/miri/src/shims/x86/sse2.rs b/src/tools/miri/src/shims/x86/sse2.rs
diff --git a/tests/ui/lint/const-item-interior-mutations-const-deref.rs b/tests/ui/lint/const-item-interior-mutations-const-deref.rs
diff --git a/tests/ui/liveness/auxiliary/aux_issue_147648.rs b/tests/ui/liveness/auxiliary/aux_issue_147648.rs
diff --git a/tests/ui/liveness/unused-assignments-from-macro-147648.rs b/tests/ui/liveness/unused-assignments-from-macro-147648.rs

Original file line number	Diff line number	Diff line change
`@@ -46,7 +46,9 @@ impl GitHubContext {`
`46`	`46`	`let patterns = if !patterns.is_empty() { Some(patterns) } else { None };`
`47`	`47`	`Some(RunType::TryJob { job_patterns: patterns })`
`48`	`48`	`}`
`49`		`- ("push", "refs/heads/auto") => Some(RunType::AutoJob),`
	`49`	`+ ("push", "refs/heads/auto" \| "refs/heads/automation/bors/auto") => {`
	`50`	`+ Some(RunType::AutoJob)`
	`51`	`+ }`
`50`	`52`	`("push", "refs/heads/main") => Some(RunType::MainJob),`
`51`	`53`	`_ => None,`
`52`	`54`	`}`