[llvm] [Transforms] Resolve FIXME: Pick the smallest legal type that fits (PR #79158)

[Arthur Eubanks via llvm-commits]

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@@ -376,15 +376,23 @@ bool Float2IntPass::validateAndTransform() {
       LLVM_DEBUG(dbgs() << "F2I: Value not guaranteed to be representable!\n");
       continue;
     }
-    if (MinBW > 64) {
-      LLVM_DEBUG(
-          dbgs() << "F2I: Value requires more than 64 bits to represent!\n");
-      continue;
-    }
 
-    // OK, R is known to be representable. Now pick a type for it.
-    // FIXME: Pick the smallest legal type that will fit.
-    Type *Ty = (MinBW > 32) ? Type::getInt64Ty(*Ctx) : Type::getInt32Ty(*Ctx);
+    // OK, R is known to be representable.
+    // Pick the smallest legal type that will fit.
+    Type *Ty = DL.getSmallestLegalIntType(*Ctx, MinBW);
+    if (!Ty) {
+      // Every supported target supports 64-bit and 32-bit integers,
+      // so fallback to a 32 or 64-bit integer if the value fits.
+      if (MinBW <= 32)
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aeubanks wrote:

nit: braces should be consistently applied, so add braces

https://github.com/llvm/llvm-project/pull/79158