[wasm] WasmBase.IsSupported no longer returns true

[vargaz]

Description

Testcase:

using System;
using System.Numerics;

public class Test
{
    public static int Main () {
        int sum = 0;
        for (int i = 0; i < 100000000; ++i) {
            sum += BitOperations.Log2 ((ulong)i);
        }
        return sum;
    }
}

JIT debug output:

converting (in B14: stack: 0) IL_000f: call      0x0600137b
cmethod = bool System.Runtime.Intrinsics.Wasm.WasmBase:get_IsSupported ()
	->  false

What seems to be happening is that the JIT first calls
arch_emit_simd_intrinsics (), which calls

	if (!strcmp (class_ns, "System.Runtime.Intrinsics.Wasm")) {
		return emit_hardware_intrinsics (cfg, cmethod, fsig, args,
			supported_wasm_intrinsics, sizeof (supported_wasm_intrinsics),
			emit_wasm_supported_intrinsics);
	}

Which doesn't handle WasmBase, but it still returns a MonoInst for WasmBase:get_IsSupported (), so
arch_emit_common_intrinsics () is never called.

Reproduction Steps

.

Expected behavior

.

Actual behavior

.

Regression?

Yes

Known Workarounds

No response

Configuration

dotnet/runtime master

Other information

No response

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

Testcase:

using System;
using System.Numerics;

public class Test
{
    public static int Main () {
        int sum = 0;
        for (int i = 0; i < 100000000; ++i) {
            sum += BitOperations.Log2 ((ulong)i);
        }
        return sum;
    }
}

JIT debug output:

converting (in B14: stack: 0) IL_000f: call      0x0600137b
cmethod = bool System.Runtime.Intrinsics.Wasm.WasmBase:get_IsSupported ()
	->  false

What seems to be happening is that the JIT first calls
arch_emit_simd_intrinsics (), which calls

	if (!strcmp (class_ns, "System.Runtime.Intrinsics.Wasm")) {
		return emit_hardware_intrinsics (cfg, cmethod, fsig, args,
			supported_wasm_intrinsics, sizeof (supported_wasm_intrinsics),
			emit_wasm_supported_intrinsics);
	}

Which doesn't handle WasmBase, but it still returns a MonoInst for WasmBase:get_IsSupported (), so
arch_emit_common_intrinsics () is never called.

Reproduction Steps

.

Expected behavior

.

Actual behavior

.

Regression?

Yes

Known Workarounds

No response

Configuration

dotnet/runtime master

Other information

No response

Author:	vargaz
Assignees:	-
Labels:	area-CodeGen-coreclr
Milestone:	-

[ghost]

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

Testcase:

using System;
using System.Numerics;

public class Test
{
    public static int Main () {
        int sum = 0;
        for (int i = 0; i < 100000000; ++i) {
            sum += BitOperations.Log2 ((ulong)i);
        }
        return sum;
    }
}

JIT debug output:

converting (in B14: stack: 0) IL_000f: call      0x0600137b
cmethod = bool System.Runtime.Intrinsics.Wasm.WasmBase:get_IsSupported ()
	->  false

What seems to be happening is that the JIT first calls
arch_emit_simd_intrinsics (), which calls

	if (!strcmp (class_ns, "System.Runtime.Intrinsics.Wasm")) {
		return emit_hardware_intrinsics (cfg, cmethod, fsig, args,
			supported_wasm_intrinsics, sizeof (supported_wasm_intrinsics),
			emit_wasm_supported_intrinsics);
	}

Which doesn't handle WasmBase, but it still returns a MonoInst for WasmBase:get_IsSupported (), so
arch_emit_common_intrinsics () is never called.

Reproduction Steps

.

Expected behavior

.

Actual behavior

.

Regression?

Yes

Known Workarounds

No response

Configuration

dotnet/runtime master

Other information

No response

Author:	vargaz
Assignees:	-
Labels:	arch-wasm, area-CodeGen-coreclr, untriaged
Milestone:	-

[vargaz]

@radekdoulik

[vargaz]

Fixed by #88523.