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[test] [builtins] Remove obsolete/UB tests in __fixuns?fdi based 

Remove the failing tests for __fixunssfdi() and __fixunsdfdi() that
relied on undefined (and most likely obsolete in terms of compiler-rt
implementation behavior).

Both tests presumed that 0x1.p+64 would be converted to
0xFFFFFFFFFFFFFFFFLL, that is the largest value in uint64 range.
However, the C/C++ standards do not specify the behavior for converting
a floating-point value to an integer of smaller range, and in this case
both libgcc and compiler-rt implementations return 0 instead.

Since the current behavior is correct with regards to standards
and there is no good way of expressing 0xFFFFFFFFFFFFFFFFLL in single-
or double-precision float, I've removed the failing test altogether.

Differential Revision: https://reviews.llvm.org/D28146

llvm-svn: 292257
This commit is contained in:
Michal Gorny 2017-01-17 21:08:25 +00:00
parent 729a039ec2
commit 7b97bf233f
2 changed files with 0 additions and 5 deletions
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3
compiler-rt/test/builtins/Unit/fixunsdfdi_test.c
View File

@ -95,9 +95,6 @@ int main()
if (test__fixunsdfdi(0x1.FFFFFFFFFFFFEp+62, 0x7FFFFFFFFFFFF800LL))
return 1;
if (test__fixunsdfdi(0x1.p+64, 0xFFFFFFFFFFFFFFFFLL))
return 1;
#if !TARGET_LIBGCC
if (test__fixunsdfdi(-0x1.FFFFFFFFFFFFFp+62, 0))
return 1;

2
compiler-rt/test/builtins/Unit/fixunssfdi_test.c
View File

@ -79,8 +79,6 @@ int main()
return 1;
if (test__fixunssfdi(0x1.000000p+63F, 0x8000000000000000LL))
return 1;
if (test__fixunssfdi(0x1.000000p+64F, 0xFFFFFFFFFFFFFFFFLL))
return 1;
if (test__fixunssfdi(0x1.FFFFFEp+62F, 0x7FFFFF8000000000LL))
return 1;
if (test__fixunssfdi(0x1.FFFFFCp+62F, 0x7FFFFF0000000000LL))