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Clean up the APInt function getDigit.

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llvm-svn: 79602
This commit is contained in:
Erick Tryzelaar 2009-08-21 06:48:37 +00:00
parent e5dbd6b0f9
commit e3280847cc
1 changed files with 19 additions and 21 deletions
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40
lib/Support/APInt.cpp
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@ -46,30 +46,27 @@ inline static uint64_t* getMemory(unsigned numWords) {
/// A utility function that converts a character to a digit.
inline static unsigned getDigit(char cdigit, uint8_t radix) {
// Get a digit
unsigned digit = 0;
unsigned r;
if (radix == 16) {
if (!isxdigit(cdigit))
llvm_unreachable("Invalid hex digit in string");
if (isdigit(cdigit))
digit = cdigit - '0';
else if (cdigit >= 'a')
digit = cdigit - 'a' + 10;
else if (cdigit >= 'A')
digit = cdigit - 'A' + 10;
else
llvm_unreachable("huh? we shouldn't get here");
} else if (isdigit(cdigit)) {
digit = cdigit - '0';
assert((radix == 10 ||
(radix == 8 && digit != 8 && digit != 9) ||
(radix == 2 && (digit == 0 || digit == 1))) &&
"Invalid digit in string for given radix");
} else {
llvm_unreachable("Invalid character in digit string");
r = cdigit - '0';
if (r <= 9)
return r;
r = cdigit - 'A';
if (r <= 5)
return r + 10;
r = cdigit - 'a';
if (r <= 5)
return r + 10;
}
return digit;
r = cdigit - '0';
if (r < radix)
return r;
return -1U;
}
@ -2076,6 +2073,7 @@ void APInt::fromString(unsigned numbits, const StringRef& str, uint8_t radix) {
// Enter digit traversal loop
for (StringRef::iterator e = str.end(); p != e; ++p) {
unsigned digit = getDigit(*p, radix);
assert(digit < radix && "Invalid character in digit string");
// Shift or multiply the value by the radix
if (slen > 1) {