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Task/Binary-digits/LLVM/binary-digits.llvm
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Task/Binary-digits/LLVM/binary-digits.llvm
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; ModuleID = 'binary.c'
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; source_filename = "binary.c"
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; target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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; target triple = "x86_64-pc-windows-msvc19.21.27702"
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; This is not strictly LLVM, as it uses the C library function "printf".
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; LLVM does not provide a way to print values, so the alternative would be
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; to just load the string into memory, and that would be boring.
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; Additional comments have been inserted, as well as changes made from the output produced by clang such as putting more meaningful labels for the jumps
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$"\01??_C@_03OFAPEBGM@?$CFs?6?$AA@" = comdat any
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;--- String constant defintions
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@"\01??_C@_03OFAPEBGM@?$CFs?6?$AA@" = linkonce_odr unnamed_addr constant [4 x i8] c"%s\0A\00", comdat, align 1
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;--- The declaration for the external C printf function.
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declare i32 @printf(i8*, ...)
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;--- The declaration for the external C log10 function.
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declare double @log10(double) #1
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;--- The declaration for the external C malloc function.
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declare noalias i8* @malloc(i64) #2
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;--- The declaration for the external C free function.
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declare void @free(i8*) #2
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;----------------------------------------------------------
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;-- Function that allocates a string with a binary representation of a number
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define i8* @bin(i32) #0 {
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;-- uint32_t x (local copy)
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%2 = alloca i32, align 4
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;-- size_t bits
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%3 = alloca i64, align 8
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;-- intermediate value
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%4 = alloca i8*, align 8
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;-- size_t i
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%5 = alloca i64, align 8
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store i32 %0, i32* %2, align 4
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;-- x == 0, start determinig what value to initially store in bits
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%6 = load i32, i32* %2, align 4
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%7 = icmp eq i32 %6, 0
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br i1 %7, label %just_one, label %calculate_logs
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just_one:
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br label %assign_bits
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calculate_logs:
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;-- log10((double) x)/log10(2) + 1
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%8 = load i32, i32* %2, align 4
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%9 = uitofp i32 %8 to double
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;-- log10((double) x)
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%10 = call double @log10(double %9) #3
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;-- log10(2)
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%11 = call double @log10(double 2.000000e+00) #3
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;-- remainder of calculation
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%12 = fdiv double %10, %11
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%13 = fadd double %12, 1.000000e+00
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br label %assign_bits
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assign_bits:
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;-- bits = (x == 0) ? 1 : log10((double) x)/log10(2) + 1;
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;-- phi basically selects what the value to assign should be based on which basic block came before
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%14 = phi double [ 1.000000e+00, %just_one ], [ %13, %calculate_logs ]
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%15 = fptoui double %14 to i64
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store i64 %15, i64* %3, align 8
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;-- char *ret = malloc((bits + 1) * sizeof (char));
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%16 = load i64, i64* %3, align 8
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%17 = add i64 %16, 1
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%18 = mul i64 %17, 1
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%19 = call noalias i8* @malloc(i64 %18)
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store i8* %19, i8** %4, align 8
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store i64 0, i64* %5, align 8
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br label %loop
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loop:
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;-- i < bits;
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%20 = load i64, i64* %5, align 8
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%21 = load i64, i64* %3, align 8
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%22 = icmp ult i64 %20, %21
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br i1 %22, label %loop_body, label %exit
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loop_body:
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;-- ret[bits - i - 1] = (x & 1) ? '1' : '0';
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%23 = load i32, i32* %2, align 4
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%24 = and i32 %23, 1
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%25 = icmp ne i32 %24, 0
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%26 = zext i1 %25 to i64
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%27 = select i1 %25, i32 49, i32 48
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%28 = trunc i32 %27 to i8
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%29 = load i8*, i8** %4, align 8
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%30 = load i64, i64* %3, align 8
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%31 = load i64, i64* %5, align 8
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%32 = sub i64 %30, %31
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%33 = sub i64 %32, 1
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%34 = getelementptr inbounds i8, i8* %29, i64 %33
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store i8 %28, i8* %34, align 1
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;-- x >>= 1;
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%35 = load i32, i32* %2, align 4
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%36 = lshr i32 %35, 1
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store i32 %36, i32* %2, align 4
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br label %loop_increment
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loop_increment:
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;-- i++;
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%37 = load i64, i64* %5, align 8
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%38 = add i64 %37, 1
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store i64 %38, i64* %5, align 8
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br label %loop
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exit:
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;-- ret[bits] = '\0';
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%39 = load i8*, i8** %4, align 8
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%40 = load i64, i64* %3, align 8
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%41 = getelementptr inbounds i8, i8* %39, i64 %40
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store i8 0, i8* %41, align 1
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;-- return ret;
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%42 = load i8*, i8** %4, align 8
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ret i8* %42
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}
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;----------------------------------------------------------
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;-- Entry point into the program
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define i32 @main() #0 {
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;-- 32-bit zero for the return
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%1 = alloca i32, align 4
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;-- size_t i, for tracking the loop index
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%2 = alloca i64, align 8
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;-- char* for the result of the bin call
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%3 = alloca i8*, align 8
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;-- initialize
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store i32 0, i32* %1, align 4
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store i64 0, i64* %2, align 8
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br label %loop
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loop:
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;-- while (i < 20)
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%4 = load i64, i64* %2, align 8
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%5 = icmp ult i64 %4, 20
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br i1 %5, label %loop_body, label %exit
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loop_body:
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;-- char *binstr = bin(i);
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%6 = load i64, i64* %2, align 8
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%7 = trunc i64 %6 to i32
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%8 = call i8* @bin(i32 %7)
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store i8* %8, i8** %3, align 8
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;-- printf("%s\n", binstr);
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%9 = load i8*, i8** %3, align 8
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%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @"\01??_C@_03OFAPEBGM@?$CFs?6?$AA@", i32 0, i32 0), i8* %9)
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;-- free(binstr);
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%11 = load i8*, i8** %3, align 8
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call void @free(i8* %11)
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br label %loop_increment
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loop_increment:
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;-- i++
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%12 = load i64, i64* %2, align 8
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%13 = add i64 %12, 1
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store i64 %13, i64* %2, align 8
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br label %loop
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exit:
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;-- return 0 (implicit)
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%14 = load i32, i32* %1, align 4
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ret i32 %14
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}
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attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind }
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!llvm.module.flags = !{!0, !1}
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!llvm.ident = !{!2}
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!0 = !{i32 1, !"wchar_size", i32 2}
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!1 = !{i32 7, !"PIC Level", i32 2}
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!2 = !{!"clang version 6.0.1 (tags/RELEASE_601/final)"}
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