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Add shortcut for unsigned_x/power_of_two -> unsigned_x >> log2(power_of_two)

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gingerBill
2025-08-10 17:53:07 +01:00
parent da76c743e9
commit 4cbcb3ace7
2 changed files with 18 additions and 0 deletions
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11
src/llvm_backend_expr.cpp
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@@ -1153,6 +1153,17 @@ gb_internal LLVMValueRef lb_integer_division(lbProcedure *p, LLVMValueRef lhs, L
return zero;
}
} else {
if (!is_signed && lb_sizeof(type) <= 8) {
u64 v = cast(u64)LLVMConstIntGetZExtValue(rhs);
if (v == 1) {
return lhs;
} else if (is_power_of_two_u64(v)) {
u64 n = floor_log2(v);
LLVMValueRef bits = LLVMConstInt(type, n, false);
return LLVMBuildLShr(p->builder, lhs, bits, "");
}
}
return call(p->builder, lhs, rhs, "");
}
}