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From: Steven Fuerst <svfuerst@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: Steven Fuerst <svfuerst@gmail.com>
Subject: [Patch v2 4/4] Annotate int2float() as being a pure function.
Date: Sat, 11 Aug 2012 10:30:22 -0700	[thread overview]
Message-ID: <1344706222-3018-4-git-send-email-svfuerst@gmail.com> (raw)
In-Reply-To: <1344706222-3018-1-git-send-email-svfuerst@gmail.com>

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(-)

diff --git a/drivers/gpu/drm/radeon/r600_blit.c b/drivers/gpu/drm/radeon/r600_blit.c
index 54980d8..b4304288 100644
--- a/drivers/gpu/drm/radeon/r600_blit.c
+++ b/drivers/gpu/drm/radeon/r600_blit.c
@@ -499,7 +499,7 @@ set_default_state(drm_radeon_private_t *dev_priv)
  * as the fractional bits will not fit in a float.  (It would be better to
  * round towards even as the fpu does, but that is slower.)
  */
-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
-- 
1.7.10.4

  parent reply	other threads:[~2012-08-11 17:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-11 17:30 [Patch v2 1/4] Replace i2f() in r600_blit.c with an optimized version Steven Fuerst
2012-08-11 17:30 ` [Patch v2 2/4] Replace i2f() in r600_blit_kms.c " Steven Fuerst
2012-08-11 17:30 ` [Patch v2 3/4] Rename i2f() to int2float(), and make it global so one copy can be removed Steven Fuerst
2012-08-11 17:30 ` Steven Fuerst [this message]
2012-08-14 10:33 ` [Patch v2 1/4] Replace i2f() in r600_blit.c with an optimized version Michel Dänzer

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