From cdc34e2cea73b7932e51ad407595d487d2d565c3 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Fri, 30 Mar 2018 09:06:01 -0600 Subject: mesa: fix MSVC bitshift overflow warnings MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In the BITFIELD_MASK() macro, if b==32 the expression evaluates to ~0u, but the compiler still sees the expression (1 << 32) in the unused part and issues a warning about integer bitshift overflow. Fix that by using (b) % 32 to ensure the max shift is 31 bits. This issue has been present for a while, but shows up much more often because of the recent VBO changes. Reviewed-by: Mathias Fröhlich Reviewed-by: Roland Scheidegger --- src/mesa/main/mtypes.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src') diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h index 801bd17666f..b7a7b34a090 100644 --- a/src/mesa/main/mtypes.h +++ b/src/mesa/main/mtypes.h @@ -59,7 +59,7 @@ extern "C" { #define BITFIELD_BIT(b) ((GLbitfield)1 << (b)) /** Set all bits up to excluding bit b */ #define BITFIELD_MASK(b) \ - ((b) == 32 ? (~(GLbitfield)0) : BITFIELD_BIT(b) - 1) + ((b) == 32 ? (~(GLbitfield)0) : BITFIELD_BIT((b) % 32) - 1) /** Set count bits starting from bit b */ #define BITFIELD_RANGE(b, count) \ (BITFIELD_MASK((b) + (count)) & ~BITFIELD_MASK(b)) -- cgit v1.2.3