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bug #935: Add asm comments in GEBP kernels to work around a bug

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in both GCC and Clang on ARM/NEON, whereby they spill registers,
severely harming performance. The reason why the asm comments
make a difference is that they prevent the compiler from
reordering code across these boundaries, which has the effect
of extending the lifetime of local variables and increasing
register pressure on this register-tight code.
This commit is contained in:
Benoit Jacob
2015-01-30 17:27:56 -05:00
parent f1092d2f73
commit 759bd92a85
2 changed files with 108 additions and 60 deletions
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8
Eigen/src/Core/util/Macros.h
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@@ -160,6 +160,12 @@
#define EIGEN_ARCH_ARM64 0
#endif
#if EIGEN_ARCH_ARM || EIGEN_ARCH_ARM64
#define EIGEN_ARCH_ARM_OR_ARM64 1
#else
#define EIGEN_ARCH_ARM_OR_ARM64 0
#endif
/// \internal EIGEN_ARCH_MIPS set to 1 if the architecture is MIPS
#if defined(__mips__) || defined(__mips)
#define EIGEN_ARCH_MIPS 1
@@ -526,7 +532,7 @@ namespace Eigen {
#define EIGEN_UNUSED_VARIABLE(var) Eigen::internal::ignore_unused_variable(var);
#if !defined(EIGEN_ASM_COMMENT)
#if EIGEN_COMP_GNUC && EIGEN_ARCH_i386_OR_x86_64
#if EIGEN_COMP_GNUC && (EIGEN_ARCH_i386_OR_x86_64 || EIGEN_ARCH_ARM_OR_ARM64)
#define EIGEN_ASM_COMMENT(X) __asm__("#" X)
#else
#define EIGEN_ASM_COMMENT(X)