[libc] Fix implicit conversion error on rv32 (#138622)

mikhailramalho · web-flow · commit 2dd296aa47ff · 2025-05-06T11:31:09.000-03:00
This patch fixes the following error on rv32 (and possibly other 32-bit archs): FPBits.h:760:40: error: implicit conversion loses integer precision: 'int' to 'size_t' (aka 'unsigned int') [-Werror,-Wimplicit-int-conversion] 760 | result.set_significand(number >> -ep); Fixes #138425.
diff --git a/libc/src/__support/FPUtil/FPBits.h b/libc/src/__support/FPUtil/FPBits.h
@@ -757,7 +757,7 @@ struct FPRepImpl : public FPRepSem<fp_type, RetT> {
       result.set_significand(number);
       result.set_biased_exponent(static_cast<StorageType>(ep + 1));
     } else {
-      result.set_significand(number >> -ep);
+      result.set_significand(number >> static_cast<unsigned>(-ep));
     }
     return RetT(result.uintval());
   }

Original file line number	Diff line number	Diff line change
`@@ -757,7 +757,7 @@ struct FPRepImpl : public FPRepSem<fp_type, RetT> {`
`757`	`757`	`result.set_significand(number);`
`758`	`758`	`result.set_biased_exponent(static_cast<StorageType>(ep + 1));`
`759`	`759`	`} else {`
`760`		`- result.set_significand(number >> -ep);`
	`760`	`+ result.set_significand(number >> static_cast<unsigned>(-ep));`
`761`	`761`	`}`
`762`	`762`	`return RetT(result.uintval());`
`763`	`763`	`}`