[llvm] [GlobalISel][RISCV] Use constant pool for large integer constants. (PR #81101)

[Craig Topper via llvm-commits]

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@@ -451,17 +460,97 @@ bool RISCVLegalizerInfo::legalizeVAStart(MachineInstr &MI,
   return true;
 }
 
+bool RISCVLegalizerInfo::shouldBeInConstantPool(APInt APImm,
+                                                bool shouldOptForSize) const {
+  unsigned BitWidth = APImm.getBitWidth();
+  assert(BitWidth == 32 || BitWidth == 64);
+  uint64_t Imm = APImm.getZExtValue();
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topperc wrote:

I think this should be getSExtValue()? Otherwise the isInt<32> will always fail on BitWidth==32.

https://github.com/llvm/llvm-project/pull/81101