#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
scalar_t__ isspace(char const);
int /*<<< orphan*/ strtod(char const *, char **);
int isnumber(const char *s) {
  if (s == NULL || *s == '\0' || isspace(*s))
    return 0;
  char *p;
  strtod(s, &p);
  return *p == '\0';
}


x86 assembly (clang, -O0):
<isnumber>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
je     115d <isnumber+0x3d>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x0,%eax
je     115d <isnumber+0x3d>
mov    -0x10(%rbp),%rax
movsbl (%rax),%edi
call   1040 <isspace@plt>
cmp    $0x0,%rax
je     1169 <isnumber+0x49>
movl   $0x0,-0x4(%rbp)
jmp    118b <isnumber+0x6b>
mov    -0x10(%rbp),%rdi
lea    -0x18(%rbp),%rsi
call   1030 <strtod@plt>
mov    -0x18(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x0,%eax
sete   %al
and    $0x1,%al
movzbl %al,%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<isnumber>:
push   %rbp
push   %rbx
push   %rax
xor    %ebp,%ebp
test   %rdi,%rdi
je     1158 <isnumber+0x38>
mov    %rdi,%rbx
mov    (%rdi),%al
test   %al,%al
je     1158 <isnumber+0x38>
movsbl %al,%edi
call   1040 <isspace@plt>
test   %rax,%rax
jne    1158 <isnumber+0x38>
mov    %rsp,%rsi
mov    %rbx,%rdi
call   1030 <strtod@plt>
mov    (%rsp),%rax
xor    %ebp,%ebp
cmpb   $0x0,(%rax)
sete   %bpl
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
define i32 @isnumber(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i8*
store i8* %0, i8** %3
%5 = load i8*, i8** %3
%6 = icmp eq i8* %5, null
br i1 %6, label %17, label %7
7: ; preds = %1
%8 = load i8*, i8** %3
%9 = load i8, i8* %8
%10 = sext i8 %9 to i32
%11 = icmp eq i32 %10, 0
br i1 %11, label %17, label %12
12: ; preds = %7
%13 = load i8*, i8** %3
%14 = load i8, i8* %13
%15 = call i64 @isspace(i8 signext %14)
%16 = icmp ne i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %12, %7, %1
store i32 0, i32* %2
br label %26
18: ; preds = %12
%19 = load i8*, i8** %3
%20 = call i32 @strtod(i8* %19, i8** %4)
%21 = load i8*, i8** %4
%22 = load i8, i8* %21
%23 = sext i8 %22 to i32
%24 = icmp eq i32 %23, 0
%25 = zext i1 %24 to i32
store i32 %25, i32* %2
br label %26
26: ; preds = %18, %17
%27 = load i32, i32* %2
ret i32 %27
}

LLVM IR (-O2):
define i32 @isnumber(i8* %0) {
%2 = alloca i8*
%3 = icmp eq i8* %0, null
br i1 %3, label %17, label %4
4: ; preds = %1
%5 = load i8, i8* %0
%6 = icmp eq i8 %5, 0
br i1 %6, label %17, label %7
7: ; preds = %4
%8 = tail call i64 @isspace(i8 signext %5)
%9 = icmp eq i64 %8, 0
br i1 %9, label %10, label %17
10: ; preds = %7
%11 = bitcast i8** %2 to i8*
%12 = call i32 @strtod(i8* %0, i8** %2)
%13 = load i8*, i8** %2
%14 = load i8, i8* %13
%15 = icmp eq i8 %14, 0
%16 = zext i1 %15 to i32
br label %17
17: ; preds = %1, %4, %7, %10
%18 = phi i32 [ %16, %10 ], [ 0, %7 ], [ 0, %4 ], [ 0, %1 ]
ret i32 %18
}