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x86: Fix build with BMI but no LZCNT extensions

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The GCC builtins for clzs and ctzs are enabled when the x86 extension
for LZCNT and TZCNT are enabled. The use of only __BMI__ in commit
f5f47987ce was incorrect.

But GCC needs both BMI and LZCNT enabled to enable this builtin.

Change-Id: I1cc7601489634e96833cfffd145647e9fc9f2f51
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
This commit is contained in:
Thiago Macieira 2016-06-08 19:03:19 -07:00
parent 7a4ce3cbcc
commit 43ff604f94
1 changed files with 2 additions and 2 deletions
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4
src/corelib/tools/qalgorithms.h
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@ -626,7 +626,7 @@ Q_DECL_RELAXED_CONSTEXPR inline uint qCountTrailingZeroBits(quint8 v) Q_DECL_NOT
Q_DECL_RELAXED_CONSTEXPR inline uint qCountTrailingZeroBits(quint16 v) Q_DECL_NOTHROW
{
#if defined(Q_CC_GNU)
# if QT_HAS_BUILTIN(__builtin_ctzs) || defined(__BMI__)
# if QT_HAS_BUILTIN(__builtin_ctzs) || (defined(__LZCNT__) && defined(__BMI__))
return v ? __builtin_ctzs(v) : 16U;
# else
return v ? __builtin_ctz(v) : 16U;
@ -689,7 +689,7 @@ Q_DECL_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint8 v) Q_DECL_NOTH
Q_DECL_RELAXED_CONSTEXPR inline uint qCountLeadingZeroBits(quint16 v) Q_DECL_NOTHROW
{
#if defined(Q_CC_GNU)
# if QT_HAS_BUILTIN(__builtin_clzs) || defined(__BMI__)
# if QT_HAS_BUILTIN(__builtin_clzs) || (defined(__LZCNT__) && defined(__BMI__))
return v ? __builtin_clzs(v) : 16U;
# else
return v ? __builtin_clz(v)-16U : 16U;