From 97f4efd573aed7ffc0ea9395f4e69ccdeb5041f6 Mon Sep 17 00:00:00 2001 From: Nanley Chery Date: Wed, 27 May 2015 13:25:30 -0700 Subject: mesa/macros: add power-of-two assertions for alignment macros ALIGN and ROUND_DOWN_TO both require that the alignment value passed into the macro be a power of two in the comments. Using software assertions verifies this to be the case. v2: use static inline functions instead of gcc-specific statement expressions (Brian). v3: fix indendation (Brian). v4: add greater than zero requirement (Anuj). Reviewed-by: Anuj Phogat Signed-off-by: Nanley Chery --- src/mesa/main/macros.h | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'src/mesa/main/macros.h') diff --git a/src/mesa/main/macros.h b/src/mesa/main/macros.h index 54df50c..c3ef42a 100644 --- a/src/mesa/main/macros.h +++ b/src/mesa/main/macros.h @@ -690,7 +690,12 @@ minify(unsigned value, unsigned levels) * * \sa ROUND_DOWN_TO() */ -#define ALIGN(value, alignment) (((value) + (alignment) - 1) & ~((alignment) - 1)) +static inline uintptr_t +ALIGN(uintptr_t value, int32_t alignment) +{ + assert((alignment > 0) && _mesa_is_pow_two(alignment)); + return (((value) + (alignment) - 1) & ~((alignment) - 1)); +} /** * Align a value down to an alignment value @@ -703,7 +708,12 @@ minify(unsigned value, unsigned levels) * * \sa ALIGN() */ -#define ROUND_DOWN_TO(value, alignment) ((value) & ~(alignment - 1)) +static inline uintptr_t +ROUND_DOWN_TO(uintptr_t value, int32_t alignment) +{ + assert((alignment > 0) && _mesa_is_pow_two(alignment)); + return ((value) & ~(alignment - 1)); +} /** Cross product of two 3-element vectors */ -- cgit v1.1