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GCC 4.8 arm EIGEN_OPTIMIZATION_BARRIER fix (#2315).

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GCC 4.8 doesn't seem to like the `g` register constraint, failing to
compile with "error: 'asm' operand requires impossible reload".

Tested `r` instead, and that seems to work, even with latest compilers.

Also fixed some minor macro issues to eliminate warnings on armv7.

Fixes #2315.


(cherry picked from commit ff07a8a639)
This commit is contained in:
Antonio Sanchez
2021-08-31 12:01:53 -07:00
committed by Antonio Sánchez
parent c2b6df6e60
commit 4ef67cbfb2
2 changed files with 4 additions and 4 deletions
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2
Eigen/src/Core/util/Macros.h
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@@ -1131,7 +1131,7 @@ namespace Eigen {
#define EIGEN_OPTIMIZATION_BARRIER(X) __asm__ ("" : "+r,v,wa" (X));
#elif EIGEN_ARCH_ARM_OR_ARM64
// General, NEON.
#define EIGEN_OPTIMIZATION_BARRIER(X) __asm__ ("" : "+g,w" (X));
#define EIGEN_OPTIMIZATION_BARRIER(X) __asm__ ("" : "+r,w" (X));
#elif EIGEN_ARCH_i386_OR_x86_64
// General, SSE.
#define EIGEN_OPTIMIZATION_BARRIER(X) __asm__ ("" : "+g,x" (X));