Merge pull request #5432 from markdryan/markdyan/fix-rvv-detection

martin-frbg · web-flow · commit e2f9f574335f · 2025-09-05T13:40:23.000-07:00
fix RVV 1.0 detection code
diff --git a/driver/others/detect_riscv64.c b/driver/others/detect_riscv64.c
@@ -63,12 +63,12 @@ uint64_t detect_riscv64_rvv100(void)
 	 * RVV 1.0 and we return 0.
 	 */
 
-	asm volatile("vsetvli x0, x0, e8, m1, ta, ma\n\t"
+	asm volatile("vsetvli t0, x0, e8, m1, ta, ma\n\t"
 		     "csrr %0, vtype\n\t"
 		     "slt %0, x0, %0\n"
 		     : "=r" (rvv10_supported)
 		     :
-		     :);
+		     :"t0", "vtype");
 
 	return rvv10_supported;
 }

Original file line number	Diff line number	Diff line change
`@@ -63,12 +63,12 @@ uint64_t detect_riscv64_rvv100(void)`
`63`	`63`	`* RVV 1.0 and we return 0.`
`64`	`64`	`*/`
`65`	`65`
`66`		`- asm volatile("vsetvli x0, x0, e8, m1, ta, ma\n\t"`
	`66`	`+ asm volatile("vsetvli t0, x0, e8, m1, ta, ma\n\t"`
`67`	`67`	`"csrr %0, vtype\n\t"`
`68`	`68`	`"slt %0, x0, %0\n"`
`69`	`69`	`: "=r" (rvv10_supported)`
`70`	`70`	`:`
`71`		`- :);`
	`71`	`+ :"t0", "vtype");`
`72`	`72`
`73`	`73`	`return rvv10_supported;`
`74`	`74`	`}`