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cbe: use wrapping for left shifts

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This commit is contained in:
Jacob Young 2022-11-02 22:57:10 -04:00
parent 4537c1b8b6
commit 085f6fd8f7
2 changed files with 19 additions and 18 deletions
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35
lib/include/zig.h vendored
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@ -279,24 +279,21 @@ zig_extern void *memset (void *, int, zig_usize);
static inline zig_##Type zig_##operation##_##Type(zig_##Type lhs, zig_##RhsType rhs) { \
return lhs operator rhs; \
}
#define zig_int_operators(w) \
zig_int_operator(u##w, u##w, and, &) \
zig_int_operator(i##w, i##w, and, &) \
zig_int_operator(u##w, u##w, or, |) \
zig_int_operator(i##w, i##w, or, |) \
zig_int_operator(u##w, u##w, xor, ^) \
zig_int_operator(i##w, i##w, xor, ^) \
zig_int_operator(u##w, u8, shl, <<) \
zig_int_operator(i##w, u8, shl, <<) \
zig_int_operator(u##w, u8, shr, >>) \
zig_int_operator(u##w, u##w, div_floor, /) \
zig_int_operator(u##w, u##w, mod, %)
zig_int_operators(8)
zig_int_operators(16)
zig_int_operators(32)
zig_int_operators(64)
#define zig_int_basic_operator(Type, operation, operator) \
zig_int_operator(Type, Type, operation, operator)
#define zig_int_shift_operator(Type, operation, operator) \
zig_int_operator(Type, u8, operation, operator)
#define zig_int_helpers(w) \
zig_int_basic_operator(u##w, and, &) \
zig_int_basic_operator(i##w, and, &) \
zig_int_basic_operator(u##w, or, |) \
zig_int_basic_operator(i##w, or, |) \
zig_int_basic_operator(u##w, xor, ^) \
zig_int_basic_operator(i##w, xor, ^) \
zig_int_shift_operator(u##w, shl, <<) \
zig_int_shift_operator(i##w, shl, <<) \
zig_int_shift_operator(u##w, shr, >>) \
\
static inline zig_i##w zig_shr_i##w(zig_i##w lhs, zig_u8 rhs) { \
zig_i##w sign_mask = lhs < zig_as_i##w(0) ? -zig_as_i##w(1) : zig_as_i##w(0); \
return ((lhs ^ sign_mask) >> rhs) ^ sign_mask; \
@ -319,10 +316,14 @@ zig_int_operators(64)
return (val & zig_as_u##w(1) << (bits - zig_as_u8(1))) != 0 \
? val | zig_minInt(i##w, bits) : val & zig_maxInt(i##w, bits); \
} \
\
zig_int_basic_operator(u##w, div_floor, /) \
\
static inline zig_i##w zig_div_floor_i##w(zig_i##w lhs, zig_i##w rhs) { \
return lhs / rhs - (((lhs ^ rhs) & (lhs % rhs)) < zig_as_i##w(0)); \
} \
\
zig_int_basic_operator(u##w, mod, %) \
\
static inline zig_i##w zig_mod_i##w(zig_i##w lhs, zig_i##w rhs) { \
zig_i##w rem = lhs % rhs; \

2
src/codegen/c.zig
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@ -2434,7 +2434,7 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.bool_or, .bit_or => try airBinOp(f, inst, "|", "or", .None),
.xor => try airBinOp(f, inst, "^", "xor", .None),
.shr, .shr_exact => try airBinBuiltinCall(f, inst, "shr", .None),
.shl, => try airBinBuiltinCall(f, inst, "shl", .None),
.shl, => try airBinBuiltinCall(f, inst, "shlw", .Bits),
.shl_exact => try airBinOp(f, inst, "<<", "shl", .None),
.not => try airNot (f, inst),