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riscv-gcc-1
Commit 15c577a8 by Richard Kenner
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(left_shift_overflows): Remove; unused. 

From-SVN: r11021
parent 3298a1b1
Showing with 0 additions and 3 deletions
gcc/fold-const.c
...@@ -84,9 +84,6 @@ static tree strip_compound_expr PROTO((tree, tree)); ...@@ -84,9 +84,6 @@ static tree strip_compound_expr PROTO((tree, tree));
#define BRANCH_COST 1 #define BRANCH_COST 1
#endif #endif
/* Yield nonzero if a signed left shift of A by B bits overflows. */
#define left_shift_overflows(a, b) ((a) != ((a) << (b)) >> (b))
/* Suppose A1 + B1 = SUM1, using 2's complement arithmetic ignoring overflow. /* Suppose A1 + B1 = SUM1, using 2's complement arithmetic ignoring overflow.
Suppose A, B and SUM have the same respective signs as A1, B1, and SUM1. Suppose A, B and SUM have the same respective signs as A1, B1, and SUM1.
Then this yields nonzero if overflow occurred during the addition. Then this yields nonzero if overflow occurred during the addition.
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