Rollup merge of rust-lang#149994 - Flakebi:amdgpu-vectors, r=jieyouxu

Allow vector types for amdgpu

The amdgpu target uses vector types in various places. The vector types can be used on all architectures, there is no associated target feature that needs to be enabled.

The largest vector type found in LLVM intrinsics is `v32i32` (`[32 x i32]`) for mfma intrinsics. Note that while this intrinsic is only supported on some architectures, the vector type itself is supported on all architectures.

Tracking issue: rust-lang#135024

(I used an empty string to say “does not need a target feature”. If you prefer an `Option` or something like that, I’ll change it.)

Author: matthiaskrgr

compiler/rustc_monomorphize/src/mono_checks/abi_check.rs

@@ -54,7 +54,7 @@ fn do_check_simd_vector_abi<'tcx>(
                     continue;
                 }
             };
-            if !have_feature(Symbol::intern(feature)) {
+            if !feature.is_empty() && !have_feature(Symbol::intern(feature)) {
                 // Emit error.
                 let (span, _hir_id) = loc();
                 tcx.dcx().emit_err(errors::AbiErrorDisabledVectorType {

compiler/rustc_target/src/target_features.rs

@@ -918,6 +918,7 @@ const AARCH64_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] =
 // We might want to add "helium" too.
 const ARM_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "neon")];
 
+const AMDGPU_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(1024, "")];
 const POWERPC_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "altivec")];
 const WASM_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "simd128")];
 const S390X_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "vector")];
@@ -996,12 +997,12 @@ impl Target {
             Arch::Mips | Arch::Mips32r6 | Arch::Mips64 | Arch::Mips64r6 => {
                 MIPS_FEATURES_FOR_CORRECT_VECTOR_ABI
             }
+            Arch::AmdGpu => AMDGPU_FEATURES_FOR_CORRECT_VECTOR_ABI,
             Arch::Nvptx64 | Arch::Bpf | Arch::M68k => &[], // no vector ABI
             Arch::CSky => CSKY_FEATURES_FOR_CORRECT_VECTOR_ABI,
             // FIXME: for some tier3 targets, we are overly cautious and always give warnings
             // when passing args in vector registers.
-            Arch::AmdGpu
-            | Arch::Avr
+            Arch::Avr
             | Arch::Msp430
             | Arch::PowerPC64LE
             | Arch::SpirV

tests/run-make/simd-ffi/rmake.rs

@@ -17,6 +17,9 @@ fn main() {
             "arm-unknown-linux-gnueabi".to_owned(),
         ]);
     }
+    if llvm_components_contain("amdgpu") {
+        targets.push("amdgcn-amd-amdhsa".to_owned());
+    }
     let mut x86_archs = Vec::new();
     if llvm_components_contain("x86") {
         x86_archs.append(&mut vec!["i686", "x86_64"]);
@@ -52,21 +55,25 @@ fn main() {
         // enabled by-default for i686 and ARM; these features will be invalid
         // on some platforms, but LLVM just prints a warning so that's fine for
         // now.
+        let mut cmd = rustc();
+        cmd.target(&target).emit("llvm-ir,asm").input("simd.rs");
         let target_feature = if target.starts_with("i686") || target.starts_with("x86") {
             "+sse2"
         } else if target.starts_with("arm") || target.starts_with("aarch64") {
             "-soft-float,+neon"
         } else if target.starts_with("mips") {
             "+msa,+fp64"
+        } else if target.starts_with("amdgcn") {
+            cmd.arg("-Ctarget-cpu=gfx900");
+            ""
         } else {
             panic!("missing target_feature case for {target}");
         };
-        rustc()
-            .target(&target)
-            .emit("llvm-ir,asm")
-            .input("simd.rs")
-            .arg(format!("-Ctarget-feature={target_feature}"))
-            .arg(&format!("-Cextra-filename=-{target}"))
-            .run();
+
+        if !target_feature.is_empty() {
+            cmd.arg(format!("-Ctarget-feature={target_feature}"));
+        }
+
+        cmd.arg(&format!("-Cextra-filename=-{target}")).run();
     }
 }