wazevo(amd64): alignment for Fmax/min (#2084)

Signed-off-by: Takeshi Yoneda <t.y.mathetake@gmail.com>

internal/engine/wazevo/backend/isa/amd64/machine.go

@@ -2171,7 +2171,8 @@ func (m *machine) lowerFminFmax(instr *ssa.Instruction) {
 
 	xDef, yDef := m.c.ValueDefinition(x), m.c.ValueDefinition(y)
 	rm := m.getOperand_Reg(xDef)
-	rn := m.getOperand_Mem_Reg(yDef)
+	// We cannot ensure that y is aligned to 16 bytes, so we have to use it on reg.
+	rn := m.getOperand_Reg(yDef)
 	rd := m.c.VRegOf(instr.Return())
 
 	tmp := m.copyToTmp(rm.reg())

internal/integration_test/fuzzcases/fuzzcases_test.go

@@ -1018,3 +1018,10 @@ func Test2082(t *testing.T) {
 	}
 	nodiff.RequireNoDiffT(t, getWasmBinary(t, "2082"), true, true)
 }
+
+func Test2084(t *testing.T) {
+	if !platform.CompilerSupported() {
+		return
+	}
+	nodiff.RequireNoDiffT(t, getWasmBinary(t, "2084"), true, true)
+}

internal/integration_test/fuzzcases/testdata/2084.wat

@@ -0,0 +1,20 @@
+(module
+ (type (;0;) (func (param i32 f64)))
+ (func (;0;) (type 0) (param i32 f64)
+   (local i32 f32 f32)
+   i32.const 0
+   if ;; label = @1
+     unreachable
+   end
+   f32.const 0x0p+0 (;=0;)
+   memory.size
+   f32.load offset=93531 align=2
+   f32.max
+   i32.reinterpret_f32
+   i32.const 0
+   i32.xor
+   global.set 0
+ )
+ (memory (;0;) 6 8)
+ (global (;0;) (mut i32) i32.const 0)
+ (export "" (func 0)))