[libc-commits] [libc] [libc] Coalesce bitfield access in GPU malloc (PR #142692)

[Matt Arsenault via libc-commits]

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@@ -129,6 +129,11 @@ static inline constexpr T round_up(const T x) {
   return (x + N) & ~(N - 1);
 }
 
+// Branch free minimum of two integers.
+static inline constexpr uint32_t min(const uint32_t &x, const uint32_t &y) {
+  return y ^ ((x ^ y) & -(x < y));
+}
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arsenm wrote:

This is already a hardware instruction, why not just do the obvious x < y ? x : y? Also why references? 

https://github.com/llvm/llvm-project/pull/142692