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julia> function dot(a, b)
s = zero(eltype(a))
for i in 1:endof(a)
s += a[i] * b[i]
end
return s
end
dot (generic function with 1 method)
julia> a = ones(100000); b = ones(100000);
julia> @code_llvm dot(a, b)
define double @julia_dot_72535(%jl_value_t*, %jl_value_t*) #0 {
top:
%2 = getelementptr inbounds %jl_value_t, %jl_value_t* %0, i64 1
%3 = bitcast %jl_value_t* %2 to i64*
%4 = load i64, i64* %3, align 8
%5 = icmp slt i64 %4, 1
br i1 %5, label %L2, label %if.lr.ph
if.lr.ph: ; preds = %top
%6 = load i64, i64* %3, align 8
%7 = getelementptr inbounds %jl_value_t, %jl_value_t* %1, i64 1
%8 = bitcast %jl_value_t* %7 to i64*
%9 = bitcast %jl_value_t* %0 to double**
%10 = bitcast %jl_value_t* %1 to double**
br label %if
L2.loopexit: ; preds = %idxend.4
br label %L2
L2: ; preds = %L2.loopexit, %top
%s.0.lcssa = phi double [ 0.000000e+00, %top ], [ %25, %L2.loopexit ]
ret double %s.0.lcssa
if: ; preds = %if.lr.ph, %idxend.4
%s.010 = phi double [ 0.000000e+00, %if.lr.ph ], [ %25, %idxend.4 ]
%"#temp#.09" = phi i64 [ 1, %if.lr.ph ], [ %17, %idxend.4 ]
%11 = add i64 %"#temp#.09", -1
%12 = icmp ult i64 %11, %6
br i1 %12, label %idxend, label %oob
oob: ; preds = %if
%13 = alloca i64, align 8
store i64 %"#temp#.09", i64* %13, align 8
call void @jl_bounds_error_ints(%jl_value_t* %0, i64* nonnull %13, i64 1)
unreachable
idxend: ; preds = %if
%14 = load i64, i64* %8, align 8
%15 = icmp ult i64 %11, %14
br i1 %15, label %idxend.4, label %oob.3
oob.3: ; preds = %idxend
%16 = alloca i64, align 8
store i64 %"#temp#.09", i64* %16, align 8
call void @jl_bounds_error_ints(%jl_value_t* %1, i64* nonnull %16, i64 1)
unreachable
idxend.4: ; preds = %idxend
%17 = add i64 %"#temp#.09", 1
%18 = load double*, double** %9, align 8
%19 = getelementptr double, double* %18, i64 %11
%20 = load double, double* %19, align 8
%21 = load double*, double** %10, align 8
%22 = getelementptr double, double* %21, i64 %11
%23 = load double, double* %22, align 8
%24 = fmul double %20, %23
%25 = fadd double %s.010, %24
%26 = icmp eq i64 %"#temp#.09", %4
br i1 %26, label %L2.loopexit, label %if
}
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