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Adds an extra explicit cast to fix Bug 7931 and removes codepaths that were never used

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llvm-svn: 111269
This commit is contained in:
Stephen Canon 2010-08-17 19:13:45 +00:00
parent 51b8b1d36c
commit 5f0e6e7b92
2 changed files with 8 additions and 22 deletions
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14
compiler-rt/lib/floatsidf.c
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@ -35,17 +35,11 @@ fp_t __floatsidf(int a) {
const int exponent = (aWidth - 1) - __builtin_clz(a); const int exponent = (aWidth - 1) - __builtin_clz(a);
rep_t result; rep_t result;
// Shift a into the significand field, rounding if it is a right-shift // Shift a into the significand field and clear the implicit bit. Extra
if (exponent <= significandBits) { // cast to unsigned int is necessary to get the correct behavior for
// the input INT_MIN.
const int shift = significandBits - exponent; const int shift = significandBits - exponent;
result = (rep_t)a << shift ^ implicitBit; result = (rep_t)(unsigned int)a << shift ^ implicitBit;
} else {
const int shift = exponent - significandBits;
result = (rep_t)a >> shift ^ implicitBit;
rep_t round = (rep_t)a << (typeWidth - shift);
if (round > signBit) result++;
if (round == signBit) result += result & 1;
}
// Insert the exponent // Insert the exponent
result += (rep_t)(exponent + exponentBias) << significandBits; result += (rep_t)(exponent + exponentBias) << significandBits;

10
compiler-rt/lib/floatunsidf.c
View File

@ -27,17 +27,9 @@ fp_t __floatunsidf(unsigned int a) {
const int exponent = (aWidth - 1) - __builtin_clz(a); const int exponent = (aWidth - 1) - __builtin_clz(a);
rep_t result; rep_t result;
// Shift a into the significand field, rounding if it is a right-shift // Shift a into the significand field and clear the implicit bit.
if (exponent <= significandBits) {
const int shift = significandBits - exponent; const int shift = significandBits - exponent;
result = (rep_t)a << shift ^ implicitBit; result = (rep_t)a << shift ^ implicitBit;
} else {
const int shift = exponent - significandBits;
result = (rep_t)a >> shift ^ implicitBit;
rep_t round = (rep_t)a << (typeWidth - shift);
if (round > signBit) result++;
if (round == signBit) result += result & 1;
}
// Insert the exponent // Insert the exponent
result += (rep_t)(exponent + exponentBias) << significandBits; result += (rep_t)(exponent + exponentBias) << significandBits;