From: Grazvydas Ignotas <notasas@gmail.com>
Date: Sat, 16 Jun 2018 18:56:13 +0000 (+0300)
Subject: radeonsi: use shifts for sign extension
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4e0d93dc0e4d37dff492305fb7aa6408f36ff147;p=mesa.git

radeonsi: use shifts for sign extension

Avoids a branch and reduces code size a tiny bit:
    text   data     bss      dec    hex filename
10804563 398653 2070368 13273584 ca89f0 /tmp/radeonsi_dri.so.old
10804499 398653 2070368 13273520 ca89b0 /tmp/radeonsi_dri.so

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
---

diff --git a/src/gallium/drivers/radeonsi/si_descriptors.c b/src/gallium/drivers/radeonsi/si_descriptors.c
index d3da8a470a4..9de0112878e 100644
--- a/src/gallium/drivers/radeonsi/si_descriptors.c
+++ b/src/gallium/drivers/radeonsi/si_descriptors.c
@@ -100,8 +100,8 @@ static uint64_t si_desc_extract_buffer_address(const uint32_t *desc)
 		      ((uint64_t)G_008F04_BASE_ADDRESS_HI(desc[1]) << 32);
 
 	/* Sign-extend the 48-bit address. */
-	if (va & (1ull << 47))
-		va |= 0xffffull << 48;
+	va <<= 16;
+	va = (int64_t)va >> 16;
 	return va;
 }