Auto merge of #107879 - icedrocket:update-llvm, r=cuviper

Update LLVM submodule

Fixes #105626

src/bootstrap/config/tests.rs

@@ -11,6 +11,11 @@ fn parse(config: &str) -> Config {
 
 #[test]
 fn download_ci_llvm() {
+ if crate::native::is_ci_llvm_modified(&parse("")) {
+ eprintln!("Detected LLVM as non-available: running in CI and modified LLVM in this change");
+ return;
+ }
+
  let parse_llvm = |s| parse(s).llvm_from_ci;
  let if_available = parse_llvm("llvm.download-ci-llvm = \"if-available\"");
 

src/bootstrap/native.rs

@@ -216,21 +216,24 @@ pub(crate) fn is_ci_llvm_available(config: &Config, asserts: bool) -> bool {
  }
  }
 
- if CiEnv::is_ci() {
+ if is_ci_llvm_modified(config) {
+ eprintln!("Detected LLVM as non-available: running in CI and modified LLVM in this change");
+ return false;
+ }
+
+ true
+}
+
+/// Returns true if we're running in CI with modified LLVM (and thus can't download it)
+pub(crate) fn is_ci_llvm_modified(config: &Config) -> bool {
+ CiEnv::is_ci() && {
  // We assume we have access to git, so it's okay to unconditionally pass
  // `true` here.
  let llvm_sha = detect_llvm_sha(config, true);
  let head_sha = output(config.git().arg("rev-parse").arg("HEAD"));
  let head_sha = head_sha.trim();
- if llvm_sha == head_sha {
- eprintln!(
- "Detected LLVM as non-available: running in CI and modified LLVM in this change"
- );
- return false;
- }
+ llvm_sha == head_sha
  }
-
- true
 }
 
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]

tests/ui/numbers-arithmetic/issue-105626.rs

@@ -0,0 +1,17 @@
+// run-pass
+// only-x86
+// min-system-llvm-version: 16
+// compile-flags: -Ctarget-feature=+sse2
+
+use std::hint::black_box;
+
+fn main() {
+ let n: i64 = black_box(0x3fffffdfffffff);
+ let r = f32::from_bits(0x5a7fffff);
+
+ assert_ne!((n as f64) as f32, n as f32);
+
+ // FIXME: these assertions fail if only x87 is enabled
+ assert_eq!(n as i64 as f32, r);
+ assert_eq!(n as u64 as f32, r);
+}