[llvm-bugs] [Bug 30512] New: Compiling ffmpeg (target-cpu i686 +sse): Do not know how to custom type legalize this operation!

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30512

            Bug ID: 30512
           Summary: Compiling ffmpeg (target-cpu i686 +sse): Do not know
                    how to custom type legalize this operation!
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Similar to bug 30298, building ffmpeg from the FreeBSD ports collection with
clang 3.9.0 release, on a 32-bit host, enabling SSE, results in:

clang -I. -I./ -DLIBICONV_PLUG -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -DZLIB_CONST -DHAVE_AV_CONFIG_H -O2 -pipe  -DLIBICONV_PLUG
-fstack-protector -fno-strict-aliasing  -msse -I/usr/local/include/vorbis
-I/usr/local/include -std=c99 -fomit-frame-pointer -pthread
-I/usr/local/include -I/usr/local/include/p11-kit-1 -I/usr/local/include
-I/usr/local/include/freetype2 -I/usr/local/include/libpng16
-I/usr/local/include/libpng16 -I/usr/local/include/freetype2
-I/usr/local/include/libpng16 -I/usr/local/include/opencv -I/usr/local/include
-I/usr/local/include/schroedinger-1.0 -I/usr/local/include/orc-0.4
-I/usr/local/include -I/usr/local/include -I/usr/local/include
-I/usr/local/include -I/usr/local/include -I/usr/local/include
-Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith
-Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes
-Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses
-Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno
-fno-signed-zeros -mstack-alignment=16 -mstackrealign -Qunused-arguments
-Werror=implicit-function-declaration -Werror=missing-prototypes
-Werror=return-type  -MMD -MF libavcodec/hevc_filter.d -MT
libavcodec/hevc_filter.o -c -o libavcodec/hevc_filter.o
libavcodec/hevc_filter.c
In file included from libavcodec/hevc_filter.c:28:
In file included from libavcodec/cabac_functions.h:46:
libavcodec/x86/cabac.h:176:5: warning: macro expansion producing 'defined' has
undefined behavior [-Wexpansion-to-defined]
#if HAVE_7REGS && !BROKEN_COMPILER
    ^
./libavutil/x86/asm.h:75:82: note: expanded from macro 'HAVE_7REGS'
#define HAVE_7REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE && HAVE_EBP_AVAILABLE &&
!defined(__clang__)))
                                                                               
 ^
Do not know how to custom type legalize this operation!
UNREACHABLE executed at
/share/dim/src/freebsd/base/projects/clang390-import/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp:21834!

This also occurs with trunk r282311, but not with 3.8.0 release, so it is a
regression.

Minimized test case:

// clang -cc1 -triple i386 -S -target-cpu i686 -target-feature +sse -O2
-vectorize-slp testcase.c
int a[4];
int b, c;
void fn1() {
  a[0] = b == 0;
  a[1] = c == 0;
  a[2] = b == 1;
  a[3] = c == 1;
}

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