[llvm-bugs] [Bug 26141] New: 7 piglit OpenCL tests regressed on AMD CAICOS GPU

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26141

            Bug ID: 26141
           Summary: 7 piglit OpenCL tests regressed on AMD CAICOS GPU
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: pavel.ondracka at email.cz
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15630
  --> https://llvm.org/bugs/attachment.cgi?id=15630&action=edit
backtrace

Specifically, the piglit opencl tests:
builtin-int-mad_sat-1.0.generated
builtin-long-clamp-1.1.generated
builtin-long-max-1.1.generated
builtin-long-min-1.1.generated
builtin-ulong-clamp-1.1.generated
builtin-ulong-max-1.1.generated
builtin-ulong-min-1.1.generated

pass with the llvm 3.7.1 branch and fail with latest master when run on the AMD
CAICOS GPU with mesa clover opencl.

example output from
generated_tests/cl/builtin/int/builtin-int-mad_sat-1.0.generated.cl:

## Test: Test int mad_sat built-in on CL 1.1
(/home/ondracka/graphics/piglit/tests/cl/program/program-tester.c) ##

# Platform supporting only version 1.1. Running test on that version.
# Running on:
#   Platform: Clover
#   Device: AMD CAICOS (DRM 2.43.0, LLVM 3.9.0)
#   OpenCL version: 1.2
#   OpenCL C version: 1.1
#   Build options:  -cl-std=CL1.1
ExpandIntegerResult #0: t42: i64 = smax t36, Constant:i64<-2147483648>

Do not know how to expand the result of this operator!
UNREACHABLE executed at
/home/ondracka/graphics/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp:1296!
Neúspěšně ukončen (SIGABRT)

Full backtrace attached.

No regression test yet, since llvm is big and the build takes ages, however I
can do it if needed and if I can get some pointers how to speed up the
bisection or the build...

System:
GPU: 06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Caicos XTX [Radeon HD 8490 / R5 235X OEM]
llvm: 92d091bf6f3da5f67e59b94a053125d3f38b5efb
libclc: b858eb3811ca8b49a66653473ef309eadcd491af
mesa: f4ab7340ca72f6b61fe6e3e0995360546d2d6287

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