From c77ada1b78ae83c88a4e964a7cbfa2e708073d8b Mon Sep 17 00:00:00 2001
From: Marcel Meyer <mm.marcelmeyer@gmail.com>
Date: Thu, 10 Apr 2025 21:52:25 +0000
Subject: [PATCH] cmd/compile/internal/ssa: simplify with built-in min, max
 functions

Change-Id: I08fa2940cd3565c578b1b323656a4fa12e0c65bb
GitHub-Last-Rev: 1f673b190ee62fe8158c9e70acf6b0882f6b3f6e
GitHub-Pull-Request: golang/go#73322
Reviewed-on: https://go-review.googlesource.com/c/go/+/664675
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
---
 src/cmd/compile/internal/ssa/writebarrier.go | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/src/cmd/compile/internal/ssa/writebarrier.go b/src/cmd/compile/internal/ssa/writebarrier.go
index e235659dc0..9ef3667d51 100644
--- a/src/cmd/compile/internal/ssa/writebarrier.go
+++ b/src/cmd/compile/internal/ssa/writebarrier.go
@@ -637,17 +637,12 @@ func (f *Func) computeZeroMap(select1 []*Value) map[ID]ZeroRegion {
 					size += ptrSize - d
 				}
 				// Clip to the 64 words that we track.
-				min := off
-				max := off + size
-				if min < 0 {
-					min = 0
-				}
-				if max > 64*ptrSize {
-					max = 64 * ptrSize
-				}
+				minimum := max(off, 0)
+				maximum := min(off+size, 64*ptrSize)
+
 				// Clear bits for parts that we are writing (and hence
 				// will no longer necessarily be zero).
-				for i := min; i < max; i += ptrSize {
+				for i := minimum; i < maximum; i += ptrSize {
 					bit := i / ptrSize
 					z.mask &^= 1 << uint(bit)
 				}