[clang] [llvm] [Clang][AArch64] Add customisable immediate range checking to NEON (PR #100278)

[via cfe-commits]

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@@ -0,0 +1,39 @@
+class ImmCheckType<int val> {
+  int Value = val;
+}
+
+// These must be kept in sync with the flags in include/clang/Basic/TargetBuiltins.h
+def ImmCheck0_31                : ImmCheckType<0>;  // 0..31 (used for e.g. predicate patterns)
+def ImmCheck1_16                : ImmCheckType<1>;  // 1..16
+def ImmCheckExtract             : ImmCheckType<2>;  // 0..(2048/sizeinbits(elt) - 1)
+def ImmCheckShiftRight          : ImmCheckType<3>;  // 1..sizeinbits(elt)
+def ImmCheckShiftRightNarrow    : ImmCheckType<4>;  // 1..sizeinbits(elt)/2
+def ImmCheckShiftLeft           : ImmCheckType<5>;  // 0..(sizeinbits(elt) - 1)
+def ImmCheck0_7                 : ImmCheckType<6>;  // 0..7
+def ImmCheckLaneIndex           : ImmCheckType<7>;  // 0..(128/(1*sizeinbits(elt)) - 1)
+def ImmCheckCvt                 : ImmCheckType<8>;  // 1..sizeinbits(elt) (same as ShiftRight)
+def ImmCheckLaneIndexCompRotate : ImmCheckType<9>;  // 0..(128/(2*sizeinbits(elt)) - 1)
+def ImmCheckLaneIndexDot        : ImmCheckType<10>; // 0..(128/(4*sizeinbits(elt)) - 1)
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SpencerAbson wrote:

True, I think `sizeinbits(vec)` is the most consistent to what we are using already.

https://github.com/llvm/llvm-project/pull/100278