From 23b52bbf23bcc3f7f64b4d3496993bee83f5f2eb Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Sun, 6 Dec 2020 22:05:00 +0100
Subject: [PATCH] pc64: assign fpsave/fprestore only once in fpuinit()

---
 sys/src/9/pc64/fpu.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/sys/src/9/pc64/fpu.c b/sys/src/9/pc64/fpu.c
index 2b9a377b7..1a5f31251 100644
--- a/sys/src/9/pc64/fpu.c
+++ b/sys/src/9/pc64/fpu.c
@@ -253,25 +253,26 @@ fpuinit(void)
 	ulong regs[4];
 
 	cr4 = getcr4() | CR4Osfxsr|CR4Oxmmex;
-	putcr4(cr4);
-	fpsave = fpssesave;
-	fprestore = fpsserestore;
-
 	if((m->cpuidcx & (Xsave|Avx)) == (Xsave|Avx) && getconf("*noavx") == nil){
 		cr4 |= CR4Oxsave;
 		putcr4(cr4);
 		m->xcr0 = 7; /* x87, sse, avx */
 		putxcr0(m->xcr0);
-		fpsave = fpxsave;
-		fprestore = fpxrestore;
-
 		cpuid(0xd, 1, regs);
-		if(regs[0] & Xsaveopt)
-			fpsave = fpxsaveopt;
 		if(regs[0] & Xsaves){
 			fpsave = fpxsaves;
 			fprestore = fpxrestores;
+		} else {
+			if(regs[0] & Xsaveopt)
+				fpsave = fpxsaveopt;
+			else
+				fpsave = fpxsave;
+			fprestore = fpxrestore;
 		}
+	} else {
+		putcr4(cr4);
+		fpsave = fpssesave;
+		fprestore = fpsserestore;
 	}
 }