[llvm-bugs] [Bug 30600] New: [avx512bw] fatal error: error in backend: Cannot select: t127: v32i8 = X86ISD::VTRUNC t126

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https://llvm.org/bugs/show_bug.cgi?id=30600

            Bug ID: 30600
           Summary: [avx512bw] fatal error: error in backend: Cannot
                    select: t127: v32i8 = X86ISD::VTRUNC t126
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: rtrieu at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

$ cat reduce.ii
char *x0;
void x6(int);
void x1(x2) {
  char x3, x4;
  int x5 = 0;
  for (; x5 < x2; x5++)
    if (x0)
      if (x0[x5] < x3)
        x3 = x0[x5];
  x4 = x3;
  x6(x4);
}
$ clang "-cc1" "-triple" "x86_64-linux-gnu" "-emit-obj" "-target-cpu" "x86-64"
"-target-feature" "+avx512bw" "-O2" "-vectorize-loops" "-x" "c" "reduce.ii"
fatal error: error in backend: Cannot select: t127: v32i8 = X86ISD::VTRUNC t126
  t126: v16i32 = vselect t47, t101, t103
    t47: v32i1 = and t122, t20
      t122: v32i1 = X86ISD::CVT2MASK t121
        t121: v32i8 = bitcast t123
          t123: v16i16 = X86ISD::VSHLI t119, Constant:i8<7>
            t119: v16i16 = bitcast t118
              t118: v32i8 = X86ISD::PCMPGT t33, t140
                t33: v32i8,ch = CopyFromReg t0, Register:v32i8 %vreg13
                  t32: v32i8 = Register %vreg13
                t140: v32i8 = extract_subvector t139, Constant:i64<0>
                  t139: v64i8,ch =
masked_load<LD32[%scevgep62](align=1)(tbaa=<0x5864dc8>)> t143:1, t18, t167,
undef:v64i8



                  t61: i64 = Constant<0>
            t90: i8 = Constant<7>
      t20: v32i1,ch = CopyFromReg t0, Register:v32i1 %vreg7
        t19: v32i1 = Register %vreg7
    t101: v16i32 = BUILD_VECTOR Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
      t100: i32 = Constant<-1>
    t103: v16i32 = BUILD_VECTOR Constant:i32<0>, Constant:i32<0>,
Constant:i32<0>, Constant:i32<0>, Constant:i32<0>, Constant:i32<0>,
Constant:i32<0>, Constant:i32<0>, Constant:i32<0>, Constant:i32<0>,
Constant:i32<0>, Constant:i32<0>, Constant:i32<0>, Constant:i32<0>,
Constant:i32<0>, Constant:i32<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
      t102: i32 = Constant<0>
In function: x1

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