b0490a04e7
According to the GCC documentation, the behaviour of __builtin_clz()
and __builtin_clzl() is undefined if the value of the input argument
is zero. Without handling this special case, these builtins have been
used for emulating the following instructions:
* Count Leading Zeros Word (cntlzw[.])
* Count Leading Zeros Doubleword (cntlzd[.])
This fixes the emulated behaviour of these instructions by adding an
additional check for this special case.
Fixes:
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|---|---|---|
| .. | ||
| Makefile | ||
| alloc.c | ||
| checksum_32.S | ||
| checksum_64.S | ||
| checksum_wrappers.c | ||
| code-patching.c | ||
| copy_32.S | ||
| copypage_64.S | ||
| copypage_power7.S | ||
| copyuser_64.S | ||
| copyuser_power7.S | ||
| crtsavres.S | ||
| div64.S | ||
| feature-fixups-test.S | ||
| feature-fixups.c | ||
| hweight_64.S | ||
| ldstfp.S | ||
| locks.c | ||
| mem_64.S | ||
| memcmp_64.S | ||
| memcpy_64.S | ||
| memcpy_power7.S | ||
| quad.S | ||
| rheap.c | ||
| sstep.c | ||
| string.S | ||
| string_64.S | ||
| test_emulate_step.c | ||
| vmx-helper.c | ||
| xor_vmx.c | ||
| xor_vmx.h | ||
| xor_vmx_glue.c | ||