From 5b1fbfba1c00be5f2e9fd9e75fb7530f218fca40 Mon Sep 17 00:00:00 2001
From: Keith Randall <khr@golang.org>
Date: Wed, 17 Aug 2022 13:09:12 -0700
Subject: cmd/compile: rewrite >>c<<c to &^(1<<c-1)
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Fixes #54496

Change-Id: I3c2ed8cd55836d5b07c8cdec00d3b584885aca79
Reviewed-on: https://go-review.googlesource.com/c/go/+/424856
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Martin Möhrmann <martin@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Martin Möhrmann <martin@golang.org>
---
 test/codegen/shift.go | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/codegen')

diff --git a/test/codegen/shift.go b/test/codegen/shift.go
index f4cfea3f82..f09a531dcb 100644
--- a/test/codegen/shift.go
+++ b/test/codegen/shift.go
@@ -392,3 +392,12 @@ func check128bitShifts(x, y uint64, bits uint) (uint64, uint64) {
 	shl := x<<s | y>>ŝ
 	return shr, shl
 }
+
+func checkShiftToMask(u []uint64, s []int64) {
+	// amd64:-"SHR",-"SHL","ANDQ"
+	u[0] = u[0] >> 5 << 5
+	// amd64:-"SAR",-"SHL","ANDQ"
+	s[0] = s[0] >> 5 << 5
+	// amd64:-"SHR",-"SHL","ANDQ"
+	u[1] = u[1] << 5 >> 5
+}
-- 
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