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Macros to eliminate 'f + 0.0' (#21568)

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This commit is contained in:
Ramiro Polla
2021-04-09 04:03:34 +02:00
committed by Scott Lahteine
parent a82b3955bb
commit 6d9aaf8de5
10 changed files with 25 additions and 18 deletions
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15
Marlin/src/core/macros.h
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@@ -187,14 +187,21 @@
#define DISABLED(V...) DO(DIS,&&,V)
#define COUNT_ENABLED(V...) DO(ENA,+,V)
#define TERN(O,A,B) _TERN(_ENA_1(O),B,A) // OPTION converted to '0' or '1'
#define TERN0(O,A) _TERN(_ENA_1(O),0,A) // OPTION converted to A or '0'
#define TERN1(O,A) _TERN(_ENA_1(O),1,A) // OPTION converted to A or '1'
#define TERN_(O,A) _TERN(_ENA_1(O),,A) // OPTION converted to A or '<nul>'
#define TERN(O,A,B) _TERN(_ENA_1(O),B,A) // OPTION ? 'A' : 'B'
#define TERN0(O,A) _TERN(_ENA_1(O),0,A) // OPTION ? 'A' : '0'
#define TERN1(O,A) _TERN(_ENA_1(O),1,A) // OPTION ? 'A' : '1'
#define TERN_(O,A) _TERN(_ENA_1(O),,A) // OPTION ? 'A' : '<nul>'
#define _TERN(E,V...) __TERN(_CAT(T_,E),V) // Prepend 'T_' to get 'T_0' or 'T_1'
#define __TERN(T,V...) ___TERN(_CAT(_NO,T),V) // Prepend '_NO' to get '_NOT_0' or '_NOT_1'
#define ___TERN(P,V...) THIRD(P,V) // If first argument has a comma, A. Else B.
// Macros to avoid 'f + 0.0' which is not always optimized away. Minus included for symmetry.
// Compiler flags -fno-signed-zeros -ffinite-math-only also cover 'f * 1.0', 'f - f', etc.
#define PLUS_TERN0(O,A) _TERN(_ENA_1(O),,+ (A)) // OPTION ? '+ (A)' : '<nul>'
#define MINUS_TERN0(O,A) _TERN(_ENA_1(O),,- (A)) // OPTION ? '- (A)' : '<nul>'
#define SUM_TERN(O,B,A) ((B) PLUS_TERN0(O,A)) // ((B) (OPTION ? '+ (A)' : '<nul>'))
#define DIFF_TERN(O,B,A) ((B) MINUS_TERN0(O,A)) // ((B) (OPTION ? '- (A)' : '<nul>'))
#define IF_ENABLED TERN_
#define IF_DISABLED(O,A) TERN(O,,A)