[Mesa-dev] [PATCH] radeonsi: use shifts for sign extension

[Grazvydas Ignotas]

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
---
 src/gallium/drivers/radeonsi/si_descriptors.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/radeonsi/si_descriptors.c b/src/gallium/drivers/radeonsi/si_descriptors.c
index 57a3124..f368ea6 100644
--- a/src/gallium/drivers/radeonsi/si_descriptors.c
+++ b/src/gallium/drivers/radeonsi/si_descriptors.c
@@ -98,12 +98,12 @@ static uint64_t si_desc_extract_buffer_address(const uint32_t *desc)
 {
 	uint64_t va = desc[0] |
 		      ((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;
 }
 
 static void si_init_descriptor_list(uint32_t *desc_list,
 				    unsigned element_dw_size,
-- 
2.7.4