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Masking a bit field is unnecessary if there was no shift operation or if the

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shift operation shifted just zeroes into the value.


git-svn-id: svn://svn.cc65.org/cc65/trunk@5412 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2012-01-20 15:54:43 +00:00
parent 772d51aa5e
commit 66f1f82943
1 changed files with 5 additions and 2 deletions
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7
src/cc65/loadexpr.c
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@ -162,8 +162,11 @@ void LoadExpr (unsigned Flags, struct ExprDesc* Expr)
unsigned F = CF_INT | CF_UNSIGNED | CF_CONST | (Flags & CF_TEST);
/* Shift right by the bit offset */
g_asr (F, Expr->BitOffs);
/* And by the width */
g_and (F, (0x0001U << Expr->BitWidth) - 1U);
/* And by the width if the field doesn't end on an int boundary */
if (Expr->BitOffs + Expr->BitWidth != CHAR_BITS &&
Expr->BitOffs + Expr->BitWidth != INT_BITS) {
g_and (F, (0x0001U << Expr->BitWidth) - 1U);
}
}
/* Expression was tested */