http://llvm.org/bugs/show_bug.cgi?id=17779
Bug ID: 17779
Summary: Integrated assembler rejects "pextrw $7,%xmm3,%r10"
Product: libraries
Version: trunk
Hardware: PC
OS: OpenBSD
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
In OpenBSD's aes_intel.S assembly
(http://www.openbsd.org/cgi-bin/cvsweb/src/sys/arch/amd64/amd64/aes_intel.S?rev=1.9;content-type=text%2Fplain),
there are several instructions like:
pextrw $7,%xmm3,%r10
These are acceptable by binutils's assembler, but not by clang's integrated
assembler:
$ echo "pextrw $7,%xmm3,%r10" | clang -c -x assembler - -o /dev/null
<stdin>:1:1: error: invalid operand for instruction
pextrw $7,%xmm3,%r10
^
Changing %r10 to %r10d allows the code to be assembled by clang, but it causes
binutils to emit slightly different output, and I'm not familiar enough with
x86-64 machine code to know if it matters or not.
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