[4/3] Annotate int2float() as being a pure function.

Commit Message

Steven Fuerst Aug. 6, 2012, 11:42 p.m. UTC

This allows gcc to fold duplicate calls into a single call.  Since
the current users do actually call it multiple times with the
same arguments, this is an obvious win.
---
 drivers/gpu/drm/radeon/r600_blit.c         |    2 +-
 drivers/gpu/drm/radeon/r600_blit_shaders.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/gpu/drm/radeon/r600_blit.c b/drivers/gpu/drm/radeon/r600_blit.c
index 7c748ba..e3c2d48 100644
--- a/drivers/gpu/drm/radeon/r600_blit.c
+++ b/drivers/gpu/drm/radeon/r600_blit.c
@@ -501,7 +501,7 @@  set_default_state(drm_radeon_private_t *dev_priv)
  * This routine depends on the mod(32) behaviour of the rotate instructions
  * on x86.
  */
-uint32_t int2float(uint32_t x)
+__pure uint32_t int2float(uint32_t x)
 {
 	uint32_t msb, exponent, fraction;
 
diff --git a/drivers/gpu/drm/radeon/r600_blit_shaders.h b/drivers/gpu/drm/radeon/r600_blit_shaders.h
index e17c2cb..2f3ce7a 100644
--- a/drivers/gpu/drm/radeon/r600_blit_shaders.h
+++ b/drivers/gpu/drm/radeon/r600_blit_shaders.h
@@ -35,5 +35,5 @@  extern const u32 r6xx_default_state[];
 extern const u32 r6xx_ps_size, r6xx_vs_size;
 extern const u32 r6xx_default_size, r7xx_default_size;
 
-uint32_t int2float(uint32_t x);
+__pure uint32_t int2float(uint32_t x);
 #endif