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-rw-r--r--compiler/rustc_codegen_gcc/src/asm.rs3
-rw-r--r--compiler/rustc_codegen_llvm/src/asm.rs16
-rw-r--r--compiler/rustc_span/src/symbol.rs1
-rw-r--r--compiler/rustc_target/src/asm/mod.rs6
-rw-r--r--compiler/rustc_target/src/asm/x86.rs11
-rw-r--r--src/test/codegen/asm-clobber_abi.rs8
-rw-r--r--src/test/ui/asm/x86_64/bad-reg.rs4
-rw-r--r--src/test/ui/asm/x86_64/bad-reg.stderr16
8 files changed, 40 insertions, 25 deletions
diff --git a/compiler/rustc_codegen_gcc/src/asm.rs b/compiler/rustc_codegen_gcc/src/asm.rs
index 2af050f0c75..2e8cd934eb2 100644
--- a/compiler/rustc_codegen_gcc/src/asm.rs
+++ b/compiler/rustc_codegen_gcc/src/asm.rs
@@ -589,6 +589,7 @@ fn reg_to_gcc(reg: InlineAsmRegOrRegClass) -> ConstraintOrRegister {
             | InlineAsmRegClass::X86(X86InlineAsmRegClass::ymm_reg) => "x",
             InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => "v",
             InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => unimplemented!(),
+            InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg0) => unimplemented!(),
             InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => unimplemented!(),
             InlineAsmRegClass::X86(
                 X86InlineAsmRegClass::x87_reg | X86InlineAsmRegClass::mmx_reg,
@@ -654,6 +655,7 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => cx.type_f32(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg) => unimplemented!(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => cx.type_i16(),
+        InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg0) => cx.type_i16(),
         InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => cx.type_i32(),
         InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
             bug!("LLVM backend does not support SPIR-V")
@@ -784,6 +786,7 @@ fn modifier_to_gcc(arch: InlineAsmArch, reg: InlineAsmRegClass, modifier: Option
             _ => unreachable!(),
         },
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => None,
+        InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg0) => None,
         InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg | X86InlineAsmRegClass::mmx_reg) => {
             unreachable!("clobber-only")
         }
diff --git a/compiler/rustc_codegen_llvm/src/asm.rs b/compiler/rustc_codegen_llvm/src/asm.rs
index dff32007918..e994001f96f 100644
--- a/compiler/rustc_codegen_llvm/src/asm.rs
+++ b/compiler/rustc_codegen_llvm/src/asm.rs
@@ -602,7 +602,9 @@ fn reg_to_llvm(reg: InlineAsmRegOrRegClass, layout: Option<&TyAndLayout<'_>>) ->
             InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => "v",
             InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => "^Yk",
             InlineAsmRegClass::X86(
-                X86InlineAsmRegClass::x87_reg | X86InlineAsmRegClass::mmx_reg,
+                X86InlineAsmRegClass::x87_reg
+                | X86InlineAsmRegClass::mmx_reg
+                | X86InlineAsmRegClass::kreg0,
             ) => unreachable!("clobber-only"),
             InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => "r",
             InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::reg) => "r",
@@ -687,7 +689,11 @@ fn modifier_to_llvm(
             _ => unreachable!(),
         },
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => None,
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg | X86InlineAsmRegClass::mmx_reg) => {
+        InlineAsmRegClass::X86(
+            X86InlineAsmRegClass::x87_reg
+            | X86InlineAsmRegClass::mmx_reg
+            | X86InlineAsmRegClass::kreg0,
+        ) => {
             unreachable!("clobber-only")
         }
         InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => None,
@@ -757,7 +763,11 @@ fn dummy_output_type<'ll>(cx: &CodegenCx<'ll, '_>, reg: InlineAsmRegClass) -> &'
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::ymm_reg)
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => cx.type_f32(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => cx.type_i16(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg | X86InlineAsmRegClass::mmx_reg) => {
+        InlineAsmRegClass::X86(
+            X86InlineAsmRegClass::x87_reg
+            | X86InlineAsmRegClass::mmx_reg
+            | X86InlineAsmRegClass::kreg0,
+        ) => {
             unreachable!("clobber-only")
         }
         InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => cx.type_i32(),
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index d9bada29589..e3ce8105a8b 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -803,6 +803,7 @@ symbols! {
         keyword,
         kind,
         kreg,
+        kreg0,
         label,
         label_break_value,
         lang,
diff --git a/compiler/rustc_target/src/asm/mod.rs b/compiler/rustc_target/src/asm/mod.rs
index 5bc4b566daf..6bc807c7c44 100644
--- a/compiler/rustc_target/src/asm/mod.rs
+++ b/compiler/rustc_target/src/asm/mod.rs
@@ -893,7 +893,7 @@ impl InlineAsmClobberAbi {
 
                     xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7,
 
-                    k1, k2, k3, k4, k5, k6, k7,
+                    k0, k1, k2, k3, k4, k5, k6, k7,
 
                     mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7,
                     st0, st1, st2, st3, st4, st5, st6, st7,
@@ -908,7 +908,7 @@ impl InlineAsmClobberAbi {
                     zmm16, zmm17, zmm18, zmm19, zmm20, zmm21, zmm22, zmm23,
                     zmm24, zmm25, zmm26, zmm27, zmm28, zmm29, zmm30, zmm31,
 
-                    k1, k2, k3, k4, k5, k6, k7,
+                    k0, k1, k2, k3, k4, k5, k6, k7,
 
                     mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7,
                     st0, st1, st2, st3, st4, st5, st6, st7,
@@ -927,7 +927,7 @@ impl InlineAsmClobberAbi {
                     zmm16, zmm17, zmm18, zmm19, zmm20, zmm21, zmm22, zmm23,
                     zmm24, zmm25, zmm26, zmm27, zmm28, zmm29, zmm30, zmm31,
 
-                    k1, k2, k3, k4, k5, k6, k7,
+                    k0, k1, k2, k3, k4, k5, k6, k7,
 
                     mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7,
                     st0, st1, st2, st3, st4, st5, st6, st7,
diff --git a/compiler/rustc_target/src/asm/x86.rs b/compiler/rustc_target/src/asm/x86.rs
index 7c136a47548..854674c7f2f 100644
--- a/compiler/rustc_target/src/asm/x86.rs
+++ b/compiler/rustc_target/src/asm/x86.rs
@@ -14,6 +14,7 @@ def_reg_class! {
         ymm_reg,
         zmm_reg,
         kreg,
+        kreg0,
         mmx_reg,
         x87_reg,
     }
@@ -38,7 +39,7 @@ impl X86InlineAsmRegClass {
             }
             Self::reg_byte => &[],
             Self::xmm_reg | Self::ymm_reg | Self::zmm_reg => &['x', 'y', 'z'],
-            Self::kreg => &[],
+            Self::kreg | Self::kreg0 => &[],
             Self::mmx_reg | Self::x87_reg => &[],
         }
     }
@@ -77,7 +78,7 @@ impl X86InlineAsmRegClass {
                 256 => Some(('y', "ymm0")),
                 _ => Some(('x', "xmm0")),
             },
-            Self::kreg => None,
+            Self::kreg | Self::kreg0 => None,
             Self::mmx_reg | Self::x87_reg => None,
         }
     }
@@ -95,7 +96,7 @@ impl X86InlineAsmRegClass {
             Self::xmm_reg => Some(('x', "xmm0")),
             Self::ymm_reg => Some(('y', "ymm0")),
             Self::zmm_reg => Some(('z', "zmm0")),
-            Self::kreg => None,
+            Self::kreg | Self::kreg0 => None,
             Self::mmx_reg | Self::x87_reg => None,
         }
     }
@@ -132,6 +133,7 @@ impl X86InlineAsmRegClass {
                 avx512f: I8, I16;
                 avx512bw: I32, I64;
             },
+            Self::kreg0 => &[],
             Self::mmx_reg | Self::x87_reg => &[],
         }
     }
@@ -294,6 +296,7 @@ def_regs! {
         zmm29: zmm_reg = ["zmm29", "xmm29", "ymm29"] % x86_64_only,
         zmm30: zmm_reg = ["zmm30", "xmm30", "ymm30"] % x86_64_only,
         zmm31: zmm_reg = ["zmm31", "xmm31", "ymm31"] % x86_64_only,
+        k0: kreg0 = ["k0"],
         k1: kreg = ["k1"],
         k2: kreg = ["k2"],
         k3: kreg = ["k3"],
@@ -323,8 +326,6 @@ def_regs! {
             "the stack pointer cannot be used as an operand for inline asm",
         #error = ["ip", "eip", "rip"] =>
             "the instruction pointer cannot be used as an operand for inline asm",
-        #error = ["k0"] =>
-            "the k0 AVX mask register cannot be used as an operand for inline asm",
     }
 }
 
diff --git a/src/test/codegen/asm-clobber_abi.rs b/src/test/codegen/asm-clobber_abi.rs
index 69e35270266..a87152e0321 100644
--- a/src/test/codegen/asm-clobber_abi.rs
+++ b/src/test/codegen/asm-clobber_abi.rs
@@ -6,21 +6,21 @@
 use std::arch::asm;
 
 // CHECK-LABEL: @clobber_sysv64
-// CHECK: ={ax},={cx},={dx},={si},={di},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
+// CHECK: ={ax},={cx},={dx},={si},={di},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k0},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
 #[no_mangle]
 pub unsafe fn clobber_sysv64() {
     asm!("", clobber_abi("sysv64"));
 }
 
 // CHECK-LABEL: @clobber_win64
-// CHECK: ={ax},={cx},={dx},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
+// CHECK: ={ax},={cx},={dx},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k0},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
 #[no_mangle]
 pub unsafe fn clobber_win64() {
     asm!("", clobber_abi("win64"));
 }
 
 // CHECK-LABEL: @clobber_sysv64
-// CHECK: =&{dx},={ax},={cx},={si},={di},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
+// CHECK: =&{dx},={ax},={cx},={si},={di},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k0},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
 #[no_mangle]
 pub unsafe fn clobber_sysv64_edx() {
     let foo: i32;
@@ -28,7 +28,7 @@ pub unsafe fn clobber_sysv64_edx() {
 }
 
 // CHECK-LABEL: @clobber_win64
-// CHECK: =&{dx},={ax},={cx},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
+// CHECK: =&{dx},={ax},={cx},={r8},={r9},={r10},={r11},={xmm0},={xmm1},={xmm2},={xmm3},={xmm4},={xmm5},={xmm6},={xmm7},={xmm8},={xmm9},={xmm10},={xmm11},={xmm12},={xmm13},={xmm14},={xmm15},~{xmm16},~{xmm17},~{xmm18},~{xmm19},~{xmm20},~{xmm21},~{xmm22},~{xmm23},~{xmm24},~{xmm25},~{xmm26},~{xmm27},~{xmm28},~{xmm29},~{xmm30},~{xmm31},~{k0},~{k1},~{k2},~{k3},~{k4},~{k5},~{k6},~{k7},~{st},~{st(1)},~{st(2)},~{st(3)},~{st(4)},~{st(5)},~{st(6)},~{st(7)},~{dirflag},~{fpsr},~{flags},~{memory}
 #[no_mangle]
 pub unsafe fn clobber_win64_edx() {
     let foo: i32;
diff --git a/src/test/ui/asm/x86_64/bad-reg.rs b/src/test/ui/asm/x86_64/bad-reg.rs
index 4c4ce8b5e9e..272372ebedc 100644
--- a/src/test/ui/asm/x86_64/bad-reg.rs
+++ b/src/test/ui/asm/x86_64/bad-reg.rs
@@ -29,13 +29,13 @@ fn main() {
         //~^ ERROR invalid register `rsp`: the stack pointer cannot be used as an operand
         asm!("", in("ip") foo);
         //~^ ERROR invalid register `ip`: the instruction pointer cannot be used as an operand
-        asm!("", in("k0") foo);
-        //~^ ERROR invalid register `k0`: the k0 AVX mask register cannot be used as an operand
 
         asm!("", in("st(2)") foo);
         //~^ ERROR register class `x87_reg` can only be used as a clobber, not as an input or output
         asm!("", in("mm0") foo);
         //~^ ERROR register class `mmx_reg` can only be used as a clobber, not as an input or output
+        asm!("", in("k0") foo);
+        //~^ ERROR register class `kreg0` can only be used as a clobber, not as an input or output
         asm!("", out("st(2)") _);
         asm!("", out("mm0") _);
         asm!("{}", in(x87_reg) foo);
diff --git a/src/test/ui/asm/x86_64/bad-reg.stderr b/src/test/ui/asm/x86_64/bad-reg.stderr
index f8b024e1acd..84b8b5ec285 100644
--- a/src/test/ui/asm/x86_64/bad-reg.stderr
+++ b/src/test/ui/asm/x86_64/bad-reg.stderr
@@ -64,24 +64,24 @@ error: invalid register `ip`: the instruction pointer cannot be used as an opera
 LL |         asm!("", in("ip") foo);
    |                  ^^^^^^^^^^^^
 
-error: invalid register `k0`: the k0 AVX mask register cannot be used as an operand for inline asm
-  --> $DIR/bad-reg.rs:32:18
-   |
-LL |         asm!("", in("k0") foo);
-   |                  ^^^^^^^^^^^^
-
 error: register class `x87_reg` can only be used as a clobber, not as an input or output
-  --> $DIR/bad-reg.rs:35:18
+  --> $DIR/bad-reg.rs:33:18
    |
 LL |         asm!("", in("st(2)") foo);
    |                  ^^^^^^^^^^^^^^^
 
 error: register class `mmx_reg` can only be used as a clobber, not as an input or output
-  --> $DIR/bad-reg.rs:37:18
+  --> $DIR/bad-reg.rs:35:18
    |
 LL |         asm!("", in("mm0") foo);
    |                  ^^^^^^^^^^^^^
 
+error: register class `kreg0` can only be used as a clobber, not as an input or output
+  --> $DIR/bad-reg.rs:37:18
+   |
+LL |         asm!("", in("k0") foo);
+   |                  ^^^^^^^^^^^^
+
 error: register class `x87_reg` can only be used as a clobber, not as an input or output
   --> $DIR/bad-reg.rs:41:20
    |
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2025-11-07 11:15:44 +0000