From 84ecebbd4ebcb6b9b04974cf035bcae6a85174c7 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Tue, 2 Nov 2021 20:11:07 +0100
Subject: [PATCH] cpu: only run SSE code when supported

Check if we can run SSE instructions before executing the denormals
SSE code.

Fixes #1775
---
 spa/plugins/support/cpu-x86.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/spa/plugins/support/cpu-x86.c b/spa/plugins/support/cpu-x86.c
index 78422ecef..ded9bfaa7 100644
--- a/spa/plugins/support/cpu-x86.c
+++ b/spa/plugins/support/cpu-x86.c
@@ -184,13 +184,18 @@ x86_init(struct impl *impl)
 static int x86_zero_denormals(void *object, bool enable)
 {
 #if defined(HAVE_SSE)
-	unsigned int mxcsr;
-	mxcsr = _mm_getcsr();
-	if (enable)
-		mxcsr |= 0x8040;
-	else
-		mxcsr &= ~0x8040;
-	_mm_setcsr(mxcsr);
+	struct impl *impl = object;
+	if (impl->flags & SPA_CPU_FLAG_SSE) {
+		unsigned int mxcsr;
+		mxcsr = _mm_getcsr();
+		if (enable)
+			mxcsr |= 0x8040;
+		else
+			mxcsr &= ~0x8040;
+		_mm_setcsr(mxcsr);
+		spa_log_debug(impl->log, "%p: zero-denormals:%s",
+				impl, enable ? "on" : "off");
+	}
 	return 0;
 #else
 	return -ENOTSUP;