Redundant bounds check #104890
Description
Unnecessary bounds check in the following snippet
static int Test(ReadOnlySpan<char> value)
{
var i = 0;
for (; i < value.Length; i++)
if (value[i] != '/')
break;
value = value.Slice(i);
foreach (var c in value)
{ }
return 0;
}G_M000_IG01: ;; offset=0x0000
sub rsp, 40
G_M000_IG02: ;; offset=0x0004
mov rax, bword ptr [rcx]
mov ecx, dword ptr [rcx+0x08]
xor edx, edx
xor r8d, r8d
test ecx, ecx
jle SHORT G_M000_IG05
align [13 bytes for IG03]
G_M000_IG03: ;; offset=0x0020
cmp word ptr [rax+2*r8], 47
jne SHORT G_M000_IG04
inc r8d
cmp r8d, ecx
jl SHORT G_M000_IG03
G_M000_IG04: ;; offset=0x0030
mov edx, r8d
G_M000_IG05: ;; offset=0x0033
cmp edx, ecx
ja SHORT G_M000_IG09
sub ecx, edx
xor eax, eax
test ecx, ecx
jle SHORT G_M000_IG07
align [1 bytes for IG06]
G_M000_IG06: ;; offset=0x0040
cmp eax, ecx
jae SHORT G_M000_IG10
inc eax
cmp eax, ecx
jl SHORT G_M000_IG06
G_M000_IG07: ;; offset=0x004A
xor eax, eax
G_M000_IG08: ;; offset=0x004C
add rsp, 40
ret
G_M000_IG09: ;; offset=0x0051
call [System.ThrowHelper:ThrowArgumentOutOfRangeException()]
int3
G_M000_IG10: ;; offset=0x0058
call CORINFO_HELP_RNGCHKFAIL
int3
; Total bytes of code: 94