[llvm] [WIP][AMDGPU] Split `isInlinableLiteral16` into three and call the specific version if possible (PR #81345)

[Stanislav Mekhanoshin via llvm-commits]

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@@ -2655,6 +2655,40 @@ bool isInlinableLiteral16(int16_t Literal, bool HasInv2Pi) {
          Val == 0x3118;   // 1/2pi
 }
 
+bool isInlinableLiteralFP16(int16_t Literal, bool HasInv2Pi) {
+  if (!HasInv2Pi)
+    return false;
+  if (isInlinableIntLiteral(Literal))
+    return true;
+  uint16_t Val = static_cast<uint16_t>(Literal);
+  return Val == 0x3C00 || // 1.0
+         Val == 0xBC00 || // -1.0
+         Val == 0x3800 || // 0.5
+         Val == 0xB800 || // -0.5
+         Val == 0x4000 || // 2.0
+         Val == 0xC000 || // -2.0
+         Val == 0x4400 || // 4.0
+         Val == 0xC400 || // -4.0
+         Val == 0x3118;   // 1/2pi
+}
+
+bool isInlinableLiteralBF16(int16_t Literal, bool HasInv2Pi) {
+  if (!HasInv2Pi)
+    return false;
+  if (isInlinableIntLiteral(Literal))
+    return true;
+  uint16_t Val = static_cast<uint16_t>(Literal);
+  return Val == 0x3F00 || // 0.5
+         Val == 0xBF00 || // -0.5
+         Val == 0x3F80 || // 1.0
+         Val == 0xBF80 || // -1.0
+         Val == 0x4000 || // 2.0
+         Val == 0xC000 || // -2.0
+         Val == 0x4080 || // 4.0
+         Val == 0xC080 || // -4.0
+         Val == 0x3E22;   // 1.0 / (2.0 * pi)
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rampitec wrote:

I do not think it is right to truncate 0x3e22f983 to 0x3e220000.

https://github.com/llvm/llvm-project/pull/81345