[llvm] [RISCV] Take SEW/LMUL into account for value tracking of vsetvli[max] (PR #82163)
Craig Topper via llvm-commits
llvm-commits at lists.llvm.org
Mon Feb 26 21:27:36 PST 2024
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@@ -1576,12 +1577,31 @@ static void computeKnownBitsFromOperator(const Operator *I,
Known.Zero.setBitsFrom(32);
break;
case Intrinsic::riscv_vsetvli:
- case Intrinsic::riscv_vsetvlimax:
- // Assume that VL output is <= 65536.
- // TODO: Take SEW and LMUL into account.
- if (BitWidth > 17)
- Known.Zero.setBitsFrom(17);
+ case Intrinsic::riscv_vsetvlimax: {
+ bool HasAVL = II->getIntrinsicID() == Intrinsic::riscv_vsetvli;
+ const ConstantRange &Range =
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topperc wrote:
getVScaleRange doesn't return a reference does it? This works because it does lifetime extension of the temporary, but I don't think there's any reason to use the reference.
https://github.com/llvm/llvm-project/pull/82163
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