From 4a71579b757d3a2eb6902c84391f429838ad4912 Mon Sep 17 00:00:00 2001
From: Paul Cercueil
Date: Thu, 30 Jan 2020 12:33:44 -0300
Subject: git subrepo clone https://git.savannah.gnu.org/git/lightning.git
 deps/lightning

subrepo:
  subdir:   "deps/lightning"
  merged:   "b0b8eb5"
upstream:
  origin:   "https://git.savannah.gnu.org/git/lightning.git"
  branch:   "master"
  commit:   "b0b8eb5"
git-subrepo:
  version:  "0.4.1"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "a04d8c2"
---
 deps/lightning/check/ret.tst | 51 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 deps/lightning/check/ret.tst

(limited to 'deps/lightning/check/ret.tst')

diff --git a/deps/lightning/check/ret.tst b/deps/lightning/check/ret.tst
new file mode 100644
index 0000000..de1d82c
--- /dev/null
+++ b/deps/lightning/check/ret.tst
@@ -0,0 +1,51 @@
+.data	16
+ok:
+.c	"ok"
+
+.code
+	jmpi main
+
+/*
+ * very simple test on purpose because otherwise it would not trigger
+ * the bug where the retr %r0 or retr_d %f0 would be omitted because
+ * the argument was already the return register, but the register end
+ * clobbered by another instruction, like the div*, and the wrong
+ * value returned because the retr* was removed and this way, lost
+ * information that the register was live at function exit.
+ */
+
+check_r0:
+	prolog
+	movi %r0 1
+	movi %r2 10
+	// on x86 this changes %rax on other arches could use %r0 as temporary
+	divi %r1 %r2 3
+	// %r0 must still be 1
+	retr %r0
+	epilog
+
+check_f0:
+	prolog
+	movi_d %f0 0.5
+	movi_d %f2 10
+	divi_d %f1 %f2 3
+	retr_d %f0
+	epilog
+
+main:
+	prolog
+	calli check_r0
+	retval %r1
+	beqi r0_ok %r1 1
+	calli @abort
+r0_ok:
+	calli check_f0
+	retval_d %f1
+	beqi_d f0_ok %f1 0.5
+	calli @abort
+f0_ok:
+	prepare
+		pushargi ok
+	finishi @puts
+	ret
+	epilog
-- 
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