https://bugs.freedesktop.org/show_bug.cgi?id=65873

          Priority: medium
            Bug ID: 65873
          Assignee: dri-devel@lists.freedesktop.org
           Summary: R600/SI: Cannot select store with truncate to 32-bit
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: awatry@gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Created attachment 80970
  --> https://bugs.freedesktop.org/attachment.cgi?id=80970&action=edit
Piglit test that triggers the error on SI

Running the attached piglit CL test, I'm getting the following on R600/SI
(Pitcairn, 7850):

LLVM ERROR: Cannot select: 0x2add8b0: ch = store 0x2add7b0, 0x2adcfb0,
0x2adc640, 0x2adbd40<ST4[%out+4], trunc to i32> [ORD=4] [ID=17]
  0x2adcfb0: i64,ch = load 0x20468b8, 0x2add1b0, 0x2adbd40<LD4[%mem+4], zext
from i32> [ORD=1] [ID=14]
    0x2add1b0: i64 = add 0x2adc140, 0x2adc540 [ORD=1] [ID=11]
      0x2adc140: i64,ch = load 0x20468b8, 0x2adc040, 0x2adbd40<LD8[undef]>
[ID=9]
        0x2adc040: i64 = add 0x2adba40, 0x2adbf40 [ID=7]
          0x2adba40: i64,ch = CopyFromReg 0x20468b8, 0x2adb940 [ID=6]
            0x2adb940: i64 = Register %vreg0 [ID=1]
          0x2adbf40: i64 = Constant<44> [ID=4]
        0x2adbd40: i64 = undef [ID=3]
      0x2adc540: i64 = Constant<4> [ID=5]
    0x2adbd40: i64 = undef [ID=3]
  0x2adc640: i64 = add 0x2adbe40, 0x2adc540 [ORD=4] [ID=13]
    0x2adbe40: i64,ch = load 0x20468b8, 0x2adbc40, 0x2adbd40<LD8[undef]>
[ID=10]
      0x2adbc40: i64 = add 0x2adba40, 0x2adbb40 [ID=8]
        0x2adba40: i64,ch = CopyFromReg 0x20468b8, 0x2adb940 [ID=6]
          0x2adb940: i64 = Register %vreg0 [ID=1]
        0x2adbb40: i64 = Constant<36> [ID=2]
      0x2adbd40: i64 = undef [ID=3]
    0x2adc540: i64 = Constant<4> [ID=5]
  0x2adbd40: i64 = undef [ID=3]


I'll attach a dump from llc -debug-only=isel in a minute.

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