Your message dated Tue, 11 Aug 2015 11:37:16 +0200 with message-id <[email protected]> and subject line fixed has caused the Debian Bug report #783543, regarding miscompile of _mm256_permutevar8x32_epi32 to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 783543: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783543 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: llvm-toolchain-3.6 Version: 1:3.6-2 Severity: serious clang 3.6 in debian miscompiles _mm256_permutevar8x32_epi32 it swaps the two first arguments: $ apt-cache policy clang-3.6 clang-3.6: Installed: 1:3.6-2 Candidate: 1:3.6-2 Version table: *** 1:3.6-2 0 500 http://ftp.de.debian.org/debian/ unstable/main amd64 $ cat test.c #include <immintrin.h> __m256i fun (__m256i a, __m256i o) { return _mm256_permutevar8x32_epi32(a, o); } $ clang-3.6 test.c -mavx2 -c -O2 $ objdump -d test.o test.o: file format elf64-x86-64 Disassembly of section .text: 0000000000000000 <fun>: 0: c4 e2 7d 36 c1 vpermd %ymm1,%ymm0,%ymm0 5: c3 retq the correct result is: vpermd %ymm0,%ymm1,%ymm0 clang 3.5 seems to produce the right result so this is a 3.6 regression
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--- Begin Message ---fixed in 1:3.6.1-1
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