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vec.h (VEC_BASE): If base is at offset 0 in the structure, use &(P)->base even if P is NULL.

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* vec.h (VEC_BASE): If base is at offset 0 in the structure,
	use &(P)->base even if P is NULL.

From-SVN: r181258
This commit is contained in:
Jakub Jelinek 2011-11-10 16:40:34 +01:00 • committed by Jakub Jelinek
parent 03989f5595
commit c8bf99b4e8
2 changed files with 8 additions and 0 deletions
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gcc/ChangeLog
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@ -1,5 +1,8 @@
2011-11-10 Jakub Jelinek <jakub@redhat.com>
* vec.h (VEC_BASE): If base is at offset 0 in the structure,
use &(P)->base even if P is NULL.
PR rtl-optimization/51023
* combine.c (simplify_comparison) <case SIGN_EXTEND>: Don't use
val_signbit_known_clear_p for signed comparison narrowing

5
gcc/vec.h
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@ -549,7 +549,12 @@ typedef struct VEC(T,A) \
} VEC(T,A)
/* Convert to base type. */
#if GCC_VERSION >= 4000
#define VEC_BASE(P) \
((offsetof (__typeof (*P), base) == 0 || (P)) ? &(P)->base : 0)
#else
#define VEC_BASE(P) ((P) ? &(P)->base : 0)
#endif
/* Vector of integer-like object. */
#define DEF_VEC_I(T) \