Add hard float support for arm platform, add tests

.drone.yml

@@ -178,6 +178,61 @@ environment:
 workspace:
   path: /drone/src
 
+steps:
+  - name: test
+    image: golang:1.22-alpine3.19
+    commands:
+      - apk update
+      - apk add --no-cache git
+      - go test -tags purego -p 1 -failfast -timeout 20m -cover -gcflags=-d=checkptr -short -v .
+      -
+---
+kind: pipeline
+type: docker
+name: go-arm-asm
+platform:
+  os: linux
+  arch: arm64
+
+environment:
+  GOPROXY: direct
+  GOARCH: arm
+  GOARM: 7
+  GOOS: linux
+  GOTRACEBACK: 2
+  GOEXPERIMENT: "cgocheck2,newinliner"
+  CGO_ENABLED: "0"
+
+workspace:
+  path: /drone/src
+
+steps:
+  - name: test
+    image: golang:1.22-alpine3.19
+    commands:
+      - apk update
+      - apk add --no-cache git
+      - go test -p 1 -failfast -timeout 20m -cover -gcflags=-d=checkptr -short -v .
+---
+kind: pipeline
+type: docker
+name: go-arm-purego
+platform:
+  os: linux
+  arch: arm64
+
+environment:
+  GOPROXY: direct
+  GOARCH: arm
+  GOARM: 7
+  GOOS: linux
+  GOTRACEBACK: 2
+  GOEXPERIMENT: "cgocheck2,newinliner"
+  CGO_ENABLED: "0"
+
+workspace:
+  path: /drone/src
+
 steps:
   - name: test
     image: golang:1.22-alpine3.19

README.md

@@ -22,7 +22,7 @@ For the C++ implementation and design of RandomX, see [github.com/tevador/Random
 |:---------------------:|:----------:|:--------------:|:------:|:----------:|:------:|:------:|:-------:|:------:|
 |        purego         |     ✅      |       ✅        |   ✅    |     ✅      |   ✅    |   ✅    |    ✅    |   ✅    |
 |       Full Mode       |     ❌      |       ✅        |   ❌    |     ✅      |   ❌    |   ✅    |    ✅    |   ❌    |
-|   Float Operations    |     hw     |     **hw**     |  soft  |   **hw**   |  soft  |  soft  |  soft   |  soft  |
+|   Float Operations    |     hw     |     **hw**     | **hw** |   **hw**   |  soft  |  soft  |  soft   |  soft  |
 |    AES Operations     |    soft    |     **hw**     |  soft  |    soft    |  soft  |  soft  |  soft   |  soft  |
 | Superscalar Execution |   native   | **native+jit** | native |   native   | native | native | native  | native |
 |     VM Execution      | **native** | **native+jit** |  soft  | **native** |  soft  |  soft  |  soft   |  soft  |

internal/asm/round_arm.go

@@ -0,0 +1,23 @@
+//go:build (arm.6 || arm.7) && !purego
+
+package asm
+
+// GetFPSCR returns the value of FPSCR register.
+func getFPSCR() (value uint32)
+
+// SetFPSCR writes the FPSCR value.
+func setFPSCR(value uint32)
+
+func setRoundingMode(mode uint8) {
+	switch mode {
+	// switch plus/minus infinity
+	case 1:
+		mode = 2
+	case 2:
+		mode = 1
+
+	}
+	fpscr := getFPSCR()
+	fpscr = (fpscr & (^uint32(0x0C00000))) | ((uint32(mode) & 3) << 22)
+	setFPSCR(fpscr)
+}

internal/asm/round_arm.s

@@ -0,0 +1,13 @@
+//go:build (arm.6 || arm.7) && !purego
+
+#include "textflag.h"
+
+TEXT ·getFPSCR(SB),NOSPLIT,$0-4
+	WORD	$0xeef1ba10	// vmrs r11, fpscr
+	MOVW R11, value+0(FP)
+	RET
+
+TEXT ·setFPSCR(SB),NOSPLIT,$0-4
+	MOVW value+0(FP), R11
+	WORD	$0xeee1ba10	// vmsr fpscr, r11
+	RET

internal/asm/round_noasm.go

@@ -1,4 +1,4 @@
-//go:build (!arm64 && !amd64 && !386) || purego
+//go:build (!arm64 && !(arm.6 || arm.7) && !amd64 && !386) || purego
 
 package asm
 

vm_bytecode_native.go

@@ -1,4 +1,4 @@
-//go:build (arm64 || amd64 || 386) && !purego
+//go:build (arm64 || arm.6 || arm.7 || amd64 || 386) && !purego
 
 package randomx
 

vm_bytecode_purego.go

@@ -1,4 +1,4 @@
-//go:build (!arm64 && !amd64 && !386) || purego
+//go:build (!arm64 && !(arm.6 || arm.7) && !amd64 && !386) || purego
 
 package randomx