1 files changed, 68 insertions, 9 deletions
diff --git a/test/codegen/stack.go b/test/codegen/stack.go
index da5ef24e13..4469b57449 100644
--- a/test/codegen/stack.go
+++ b/test/codegen/stack.go
@@ -11,22 +11,81 @@ import "runtime"
 // This file contains code generation tests related to the use of the
 // stack.
 
-// check that stack stores are optimized away
+// Check that stack stores are optimized away.
 
-// 386:"TEXT\t.*, [$]0-4"
-// amd64:"TEXT\t.*, [$]0-8"
-// arm:"TEXT\t.*, [$]-4-4"
-// arm64:"TEXT\t.*, [$]-8-8"
-// s390x:"TEXT\t.*, [$]0-8"
-// ppc64le:"TEXT\t.*, [$]0-8"
-// mips:"TEXT\t.*, [$]-4-4"
+// 386:"TEXT\t.*, [$]0-"
+// amd64:"TEXT\t.*, [$]0-"
+// arm:"TEXT\t.*, [$]-4-"
+// arm64:"TEXT\t.*, [$]-8-"
+// mips:"TEXT\t.*, [$]-4-"
+// ppc64le:"TEXT\t.*, [$]0-"
+// s390x:"TEXT\t.*, [$]0-"
 func StackStore() int {
 	var x int
 	return *(&x)
 }
 
+type T struct {
+	A, B, C, D int // keep exported fields
+	x, y, z    int // reset unexported fields
+}
+
+// Check that large structs are cleared directly (issue #24416).
+
+// 386:"TEXT\t.*, [$]0-"
+// amd64:"TEXT\t.*, [$]0-"
+// arm:"TEXT\t.*, [$]0-" (spills return address)
+// arm64:"TEXT\t.*, [$]-8-"
+// mips:"TEXT\t.*, [$]-4-"
+// ppc64le:"TEXT\t.*, [$]0-"
+// s390x:"TEXT\t.*, [$]0-"
+func ZeroLargeStruct(x *T) {
+	t := T{}
+	*x = t
+}
+
+// Check that structs are partially initialised directly (issue #24386).
+
+// Notes:
+// - 386 fails due to spilling a register
+// amd64:"TEXT\t.*, [$]0-"
+// arm:"TEXT\t.*, [$]0-" (spills return address)
+// arm64:"TEXT\t.*, [$]-8-"
+// ppc64le:"TEXT\t.*, [$]0-"
+// s390x:"TEXT\t.*, [$]0-"
+// Note: that 386 currently has to spill a register.
+func KeepWanted(t *T) {
+	*t = T{A: t.A, B: t.B, C: t.C, D: t.D}
+}
+
+// Check that small array operations avoid using the stack (issue #15925).
+
+// Notes:
+// - 386 fails due to spilling a register
+// - arm & mips fail due to softfloat calls
+// amd64:"TEXT\t.*, [$]0-"
+// arm64:"TEXT\t.*, [$]-8-"
+// ppc64le:"TEXT\t.*, [$]0-"
+// s390x:"TEXT\t.*, [$]0-"
+func ArrayAdd64(a, b [4]float64) [4]float64 {
+	return [4]float64{a[0] + b[0], a[1] + b[1], a[2] + b[2], a[3] + b[3]}
+}
+
+// Check that small array initialization avoids using the stack.
+
+// 386:"TEXT\t.*, [$]0-"
+// amd64:"TEXT\t.*, [$]0-"
+// arm:"TEXT\t.*, [$]0-" (spills return address)
+// arm64:"TEXT\t.*, [$]-8-"
+// mips:"TEXT\t.*, [$]-4-"
+// ppc64le:"TEXT\t.*, [$]0-"
+// s390x:"TEXT\t.*, [$]0-"
+func ArrayInit(i, j int) [4]int {
+	return [4]int{i, 0, j, 0}
+}
+
 // Check that assembly output has matching offset and base register
-// (Issue #21064).
+// (issue #21064).
 
 // amd64:`.*b\+24\(SP\)`
 // arm:`.*b\+4\(FP\)`